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burhan101 Group Title

Tell me what i'm doing wrong, picture is attached.

  • 2 years ago
  • 2 years ago

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  1. burhan101 Group Title
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    • 2 years ago
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  2. Skaematik Group Title
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    3rd to 4th line - the numerator shows s^3 but a c appeared

    • 2 years ago
  3. Dido525 Group Title
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    You also made a mistake on the RHS. You can't cross out the sin's and cos's like that.

    • 2 years ago
  4. Dido525 Group Title
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    Instead there is a trig identity there.

    • 2 years ago
  5. burhan101 Group Title
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    how do i fix this ? :S

    • 2 years ago
  6. Dido525 Group Title
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    There is a trig identity on the RHS.

    • 2 years ago
  7. Skaematik Group Title
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    At the 4th line, try combining the denominator

    • 2 years ago
  8. Dido525 Group Title
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    |dw:1353385333795:dw|

    • 2 years ago
  9. burhan101 Group Title
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    Doesnt the denominator get cancelled out already ?

    • 2 years ago
  10. burhan101 Group Title
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    @Dido525 like this |dw:1353385466311:dw|

    • 2 years ago
  11. Dido525 Group Title
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    |dw:1353385495522:dw|

    • 2 years ago
  12. burhan101 Group Title
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    |dw:1353385573816:dw|

    • 2 years ago
  13. Dido525 Group Title
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    Yeah that's right.

    • 2 years ago
  14. Skaematik Group Title
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    For the left hand side, from the 3rd line, combine the denominator Then, factor the numerator This will allow you to use a trig identity to prove the original equation

    • 2 years ago
  15. Dido525 Group Title
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    I misread sorry.

    • 2 years ago
  16. burhan101 Group Title
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    it's okay, but is that way correct now ?

    • 2 years ago
  17. Skaematik Group Title
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    yes its right

    • 2 years ago
  18. Dido525 Group Title
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    Yes that is correct.

    • 2 years ago
  19. burhan101 Group Title
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    @Skaematik like this |dw:1353385871631:dw|

    • 2 years ago
  20. Skaematik Group Title
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    no

    • 2 years ago
  21. Skaematik Group Title
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    \[\frac{ s ^{4}+c ^{4}+2s ^{2}c ^{2} }{ cs }\]

    • 2 years ago
  22. burhan101 Group Title
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    i'm having difficulties seeing how it get's the fourth power, can you please explain

    • 2 years ago
  23. Dido525 Group Title
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    @burhan101 : TO be honest I would only change ONE side to try and make it equal to the other not manipulate both.

    • 2 years ago
  24. Skaematik Group Title
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    \[\frac{ s ^{2}s }{ c } + \frac{ c ^{2}c }{ s } + 2s\]

    • 2 years ago
  25. Skaematik Group Title
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    Make the denominator cs Multiply 1st term by s Multiply 2nd term by c Multiply 3rd term by cs

    • 2 years ago
  26. Skaematik Group Title
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    @dido525 changing the RHS is perfectly OK, in most cases it is actually the only way you can solve the problem without spending 234098723094 hours trying to go through ridiculous transformations

    • 2 years ago
  27. Dido525 Group Title
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    Meh.

    • 2 years ago
  28. burhan101 Group Title
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    @Dido525 yes, that's what my teacher want's us to try to do too, but im having alot of problems with this question, seems very complicated -.-

    • 2 years ago
  29. Dido525 Group Title
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    Ohh!!! Hold on I am getting close!

    • 2 years ago
  30. burhan101 Group Title
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    Okay :)

    • 2 years ago
  31. Dido525 Group Title
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    Got it!!!!!

    • 2 years ago
  32. Dido525 Group Title
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    And I only changed one side :) .

    • 2 years ago
  33. Dido525 Group Title
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    Okay. The idea is we want to start with the complicated side. Lets choose the left side.

    • 2 years ago
  34. Dido525 Group Title
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    Okay?

    • 2 years ago
  35. burhan101 Group Title
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    okay !

    • 2 years ago
  36. burhan101 Group Title
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    should we start fresh, from the given problem ?

    • 2 years ago
  37. Dido525 Group Title
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    yes :) .

    • 2 years ago
  38. burhan101 Group Title
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    Alrightt !

    • 2 years ago
  39. Dido525 Group Title
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    So we have: |dw:1353386616775:dw|

    • 2 years ago
  40. Dido525 Group Title
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    You know:|dw:1353386673693:dw|

    • 2 years ago
  41. burhan101 Group Title
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    yup

    • 2 years ago
  42. Dido525 Group Title
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    I would change the sin^2(x) and cos^2(x) To match that formula :) .

    • 2 years ago
  43. burhan101 Group Title
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    Ohhh okay !

    • 2 years ago
  44. Dido525 Group Title
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    Tell me what you get.

    • 2 years ago
  45. burhan101 Group Title
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    |dw:1353386849843:dw| DO we change that into a one, or no ?

    • 2 years ago
  46. burhan101 Group Title
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    i think i'm wrong -_-

    • 2 years ago
  47. Dido525 Group Title
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    No you do not change that to a one.

    • 2 years ago
  48. burhan101 Group Title
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    okay so first we change everything to sin & cos

    • 2 years ago
  49. Dido525 Group Title
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    Well if sin^2(x) + cos^(x) =1 that what is Sin^2(x) equal to?

    • 2 years ago
  50. Dido525 Group Title
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    No no!!!

    • 2 years ago
  51. Dido525 Group Title
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    We want to keep tan and cot.

    • 2 years ago
  52. burhan101 Group Title
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    why? that's how im taught to do it haha :$

    • 2 years ago
  53. burhan101 Group Title
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    it would be equal to 1/2

    • 2 years ago
  54. Dido525 Group Title
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    But since we have a tan and cot on the other side it's natural we want to keep it that way :P . I was taught that way too ^_^ . Sometiems we gotta break the rules.

    • 2 years ago
  55. burhan101 Group Title
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    ohhh alright, i see what you're saying

    • 2 years ago
  56. Dido525 Group Title
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    So what do you get? Feel free to do it on paper and take pics.

    • 2 years ago
  57. Skaematik Group Title
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    burhan, don't listen to him. You CAN change the right hand side (cot and tan). And sometimes you must. It makes no sense not to change them

    • 2 years ago
  58. Dido525 Group Title
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    @Skaematik : But his teacher wants him to only change one side.

    • 2 years ago
  59. Dido525 Group Title
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    It only took 4 steps lol @Skaematik .

    • 2 years ago
  60. burhan101 Group Title
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    • 2 years ago
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  61. Dido525 Group Title
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    No....

    • 2 years ago
  62. burhan101 Group Title
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    @Skaematik i know i can but the thing is i have to do it my teacher's method or she takes off marks :(

    • 2 years ago
  63. burhan101 Group Title
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    @Dido525 oh no :(

    • 2 years ago
  64. burhan101 Group Title
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    sorry, im SO confused tho

    • 2 years ago
  65. Dido525 Group Title
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    |dw:1353387439718:dw|

    • 2 years ago
  66. Dido525 Group Title
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    :) .

    • 2 years ago
  67. Dido525 Group Title
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    I am SURE you can do the rest :) .

    • 2 years ago
  68. Dido525 Group Title
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    Expand it out and change the Tan(x) and Cot(x) into Sin's and cos's .

    • 2 years ago
  69. burhan101 Group Title
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    okay, i will try

    • 2 years ago
  70. burhan101 Group Title
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    |dw:1353387756754:dw|

    • 2 years ago
  71. burhan101 Group Title
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    multiply those like that ?

    • 2 years ago
  72. Dido525 Group Title
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    Yep!

    • 2 years ago
  73. burhan101 Group Title
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    like that :S

    • 2 years ago
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  74. Dido525 Group Title
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    Good but leave sin(x)/cos(x) as Tan(x) and the cos(x)/sin(x) as Cot(x) .

    • 2 years ago
  75. burhan101 Group Title
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    i can't i get marks taken off if i do, my teacher has a checklist that we MUST follow or she takes off marks :P

    • 2 years ago
  76. burhan101 Group Title
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    okay, i don't know what to do from here on

    • 2 years ago
  77. Dido525 Group Title
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    I would riot at the teacher TBH.

    • 2 years ago
  78. Dido525 Group Title
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    Okay then.

    • 2 years ago
  79. burhan101 Group Title
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    haha trust me me too :P

    • 2 years ago
  80. Dido525 Group Title
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    We can cancel out a cos(x) from the first fraction and a sin(x) from the other fraction. You notice that?

    • 2 years ago
  81. Dido525 Group Title
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    You have very neat handwriting Btw.

    • 2 years ago
  82. burhan101 Group Title
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    Thank-you :)

    • 2 years ago
  83. burhan101 Group Title
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    Like so :

    • 2 years ago
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  84. Dido525 Group Title
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    You Cannot do this!!!

    • 2 years ago
  85. burhan101 Group Title
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    ohh

    • 2 years ago
  86. Dido525 Group Title
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    |dw:1353388449271:dw| No!!!

    • 2 years ago
  87. burhan101 Group Title
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    then what do i cancel out . :S

    • 2 years ago
  88. Dido525 Group Title
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    You can only cancel out terms if they have the same common denominator. You do not have the same common denominator in this case :) .

    • 2 years ago
  89. burhan101 Group Title
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    oh yeah, wooops

    • 2 years ago
  90. Dido525 Group Title
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    |dw:1353388530585:dw|

    • 2 years ago
  91. Dido525 Group Title
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    I KNOW you can solve the rest!

    • 2 years ago
  92. burhan101 Group Title
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    does it look like this,

    • 2 years ago
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  93. Dido525 Group Title
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    Yep!

    • 2 years ago
  94. Dido525 Group Title
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    DO YOU NOTICE SOMETHING YOU CAN CANCEL?!?!!?!

    • 2 years ago
  95. Dido525 Group Title
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    So rry... I am a bit of a math freak lol.

    • 2 years ago
  96. burhan101 Group Title
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    i'm afraid not :(

    • 2 years ago
  97. Dido525 Group Title
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    Look harder!!! We have a 2Sin(x)scos(x) . We can eliminate that!!! We

    • 2 years ago
  98. Dido525 Group Title
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    Do you see how?!?!?!

    • 2 years ago
  99. burhan101 Group Title
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    sin^2x ?

    • 2 years ago
  100. Dido525 Group Title
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    No!!!

    • 2 years ago
  101. burhan101 Group Title
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    OH i think i see it

    • 2 years ago
  102. burhan101 Group Title
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    -sinxcosx+2sinxcosx= sinxcosx

    • 2 years ago
  103. Dido525 Group Title
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    VERY CLOSE!!!! We can get rid of that too!!!

    • 2 years ago
  104. burhan101 Group Title
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    ohh i see it again haha |dw:1353389264088:dw|

    • 2 years ago
  105. Dido525 Group Title
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    Yep!!!

    • 2 years ago
  106. burhan101 Group Title
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    Yaaay ! :D

    • 2 years ago
  107. Dido525 Group Title
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    So now we have: |dw:1353389317704:dw|

    • 2 years ago
  108. burhan101 Group Title
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    one ?

    • 2 years ago
  109. burhan101 Group Title
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    no

    • 2 years ago
  110. burhan101 Group Title
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    |dw:1353389480538:dw|

    • 2 years ago
  111. Dido525 Group Title
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    You know sin(x)/cos(x) is tan (x) :P .

    • 2 years ago
  112. burhan101 Group Title
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    yuppp & cosx/sinx = cot

    • 2 years ago
  113. Dido525 Group Title
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    GOod!

    • 2 years ago
  114. burhan101 Group Title
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    |dw:1353389561044:dw|

    • 2 years ago
  115. Dido525 Group Title
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    Hence proved :) .

    • 2 years ago
  116. burhan101 Group Title
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    THANKYOU ! i swear only you had the patience to help me for so long ^.^ :)

    • 2 years ago
  117. Dido525 Group Title
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    I remember I helped someone for 2 hour slol.

    • 2 years ago
  118. burhan101 Group Title
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    thanksss again :D i would give you a cookie if i could haha

    • 2 years ago
  119. Dido525 Group Title
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    I swear if the teacher takes marks off you need to protest. All of this is valid.

    • 2 years ago
  120. burhan101 Group Title
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    I don't think she will because i changed the format to accommodate how she likes to mark !

    • 2 years ago
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