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lilsis76

  • 3 years ago

Prove the identites are Equal Sin A - cos A / sin A + cos A - sin A / cos A = 2 - sec A csc A

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  1. lilsis76
    • 3 years ago
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    |dw:1349291754923:dw| @hartnn this is the other problem.

  2. hartnn
    • 3 years ago
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    write cos A - sin A as - (sin A-cos A)

  3. lilsis76
    • 3 years ago
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    |dw:1349292009958:dw|

  4. hartnn
    • 3 years ago
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    i asked u to write cos A - sin A as - (sin A-cos A) u have written cos A - sin A as - (cos A + sin A) ..... -.- ....

  5. lilsis76
    • 3 years ago
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    oh. haha. im sorry im very bad at this. im more of a visual learner. just a moment let me fix this.

  6. lilsis76
    • 3 years ago
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    wait, i just realized, were talking about the far left fraction right?

  7. hartnn
    • 3 years ago
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    middle.

  8. lilsis76
    • 3 years ago
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    oka. let me try now

  9. lilsis76
    • 3 years ago
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    |dw:1349292496553:dw|

  10. hartnn
    • 3 years ago
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    i asked u to write cos A - sin A as - (sin A-cos A) u have written cos A - sin A as - (sin A +cos A) ..... -.- ....

  11. lilsis76
    • 3 years ago
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    but how is that possible that its a - cos A ? I dont see it

  12. hartnn
    • 3 years ago
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    - (sin A-cos A) = -sin A -(-cos A) = -sin A +cos A = cos A -sin A

  13. lilsis76
    • 3 years ago
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    |dw:1349292833969:dw|

  14. hartnn
    • 3 years ago
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    ok , lets forget everything, lets go another way. can u separate out the denominator ?

  15. hartnn
    • 3 years ago
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    like (a+b)/c = a/c + b/ c

  16. lilsis76
    • 3 years ago
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    i think i can, but it would be in 4 sections right? like sin A / Sin A - cos A/sinA + cos A/cos A -sinA/cos A

  17. hartnn
    • 3 years ago
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    absolutely correct! whats sin A/ sin A =? and cos A/cos A = ?

  18. lilsis76
    • 3 years ago
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    there going to equal 1

  19. hartnn
    • 3 years ago
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    so u got 2 right ?

  20. lilsis76
    • 3 years ago
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    what? well if u add them 1 + 1 = that makes 2

  21. hartnn
    • 3 years ago
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    yes. now u are left with -cos A/sinA -sinA/cos A cross multiply again, same as previous problem

  22. lilsis76
    • 3 years ago
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    |dw:1349293671738:dw|

  23. hartnn
    • 3 years ago
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    which is ?

  24. lilsis76
    • 3 years ago
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    which is 1

  25. hartnn
    • 3 years ago
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    -(sin^2x + cos^2 x) = -1

  26. lilsis76
    • 3 years ago
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    oh shoot. thats right... okay because it was a negative the answer will be negative too.

  27. lilsis76
    • 3 years ago
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    okay i got the same answer too

  28. hartnn
    • 3 years ago
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    what was left in the denominator

  29. lilsis76
    • 3 years ago
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    |dw:1349293889401:dw|

  30. lilsis76
    • 3 years ago
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    Okay this is what i have so far. I like to put things in steps.

  31. hartnn
    • 3 years ago
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    |dw:1349294146174:dw| see this.

  32. hartnn
    • 3 years ago
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    makes sense ?

  33. lilsis76
    • 3 years ago
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    ya i see it, i under stand it but just forgot where the 2 came from. it came from the 2 fractions that crossed each other out right?

  34. hartnn
    • 3 years ago
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    it came from sinx/sin x + cosx / cos x = 1+1 = 2

  35. lilsis76
    • 3 years ago
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    okay, ya thats what i thought :)

  36. lilsis76
    • 3 years ago
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    now how can we get rid of that - 1 ?

  37. hartnn
    • 3 years ago
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    |dw:1349294542963:dw| what is 1/sin a and 1/ cos a ?

  38. lilsis76
    • 3 years ago
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    the 1/ sin a = the inverse of cos. that is csc and 1/ cos a = is the inverse of sine sec

  39. hartnn
    • 3 years ago
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    |dw:1349294713780:dw| got it ?

  40. lilsis76
    • 3 years ago
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    i got it..............man WHAT THE HEY?! why is this so complicating?!

  41. lilsis76
    • 3 years ago
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    do u have any advice for me to kind of remember what to do. Because I know what the inverse fractions look like and everything I just get stuck all the time.

  42. hartnn
    • 3 years ago
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    3 tips: 1. practice. 2. more practice. 3. more and more practice. want 4th ? :P

  43. lilsis76
    • 3 years ago
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    really?!......I try doing more homework problems as practice and i get more confused. then i go to tutoring at school. ugH?! math hates my brain

  44. hartnn
    • 3 years ago
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    have patience, you will understand someday. else i will be there to help u.

  45. lilsis76
    • 3 years ago
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    okay then. Thank you for helping me out. Im going to work on english. Have a good day.

  46. hartnn
    • 3 years ago
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    think positive, think u like math. u also have a good day, i will have good night :)

  47. lilsis76
    • 3 years ago
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    |dw:1349295088469:dw|

  48. hartnn
    • 3 years ago
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    |dw:1349295140875:dw|

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