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amruta1997 Group Title

how to find value of sin 18.......plz explain in detail

  • 2 years ago
  • 2 years ago

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  1. Rezz5 Group Title
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    without the use of the calculator?

    • 2 years ago
  2. amruta1997 Group Title
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    ya

    • 2 years ago
  3. amruta1997 Group Title
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    how 2 derivate it

    • 2 years ago
  4. Rezz5 Group Title
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    taylor expansion can estimate it for you

    • 2 years ago
  5. amruta1997 Group Title
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    i did not get what u want to say

    • 2 years ago
  6. amruta1997 Group Title
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    sauravshakya u may try

    • 2 years ago
  7. amruta1997 Group Title
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    who is taylor

    • 2 years ago
  8. Rezz5 Group Title
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    Taylor Expansion is the way of estimating and function sinx is \[x-\frac{ x ^{3} }{ 6 }+\frac{ x ^{5} }{ 120 } -...+...\]

    • 2 years ago
  9. sauravshakya Group Title
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    5*18=90 sin(5*18)=sin90 Let x=18 then, sin(5x)=sin90

    • 2 years ago
  10. amruta1997 Group Title
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    i think u r wrog somewhere

    • 2 years ago
  11. sauravshakya Group Title
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    U can proceed from here but this will be too long but it will give u exact value.

    • 2 years ago
  12. amruta1997 Group Title
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    we dont have a formula for sin 5 thete

    • 2 years ago
  13. sauravshakya Group Title
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    From sin(5x)=1 u need to find the value of sinx

    • 2 years ago
  14. amruta1997 Group Title
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    i mean to say we dont have its expansion

    • 2 years ago
  15. sauravshakya Group Title
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    sin(5x) = sin(2x + 3x) = sin2x * cos3x + cos2x * sin3x

    • 2 years ago
  16. amruta1997 Group Title
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    hmmmmm that wd be 22 long

    • 2 years ago
  17. gohangoku58 Group Title
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    5x= 90 2x+3x=90 3x=90-2x sin 3x= cos 2x now put formula of sin 3x and cos 2x in terms of sin x only.

    • 2 years ago
  18. amruta1997 Group Title
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    hmmmmmm this wd b an easy one

    • 2 years ago
  19. Rezz5 Group Title
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    18=Pi/10 sin(Pi/10)=0.3090169944 F[x]\[=x-\frac{ x ^{3} }{ 6 }+\frac{ x ^{5} }{ 120 }-... \] f[Pi/10]==0.3090170542 you decide

    • 2 years ago
  20. sauravshakya Group Title
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    Great!

    • 2 years ago
  21. amruta1997 Group Title
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    but when we will solve the quadrtic equation then we will get two values of sin theta

    • 2 years ago
  22. amruta1997 Group Title
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    which one is great

    • 2 years ago
  23. sauravshakya Group Title
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    @gohangoku58 's one

    • 2 years ago
  24. amruta1997 Group Title
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    hmmmmmmm

    • 2 years ago
  25. sauravshakya Group Title
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    because that gives exact value not approximate

    • 2 years ago
  26. amruta1997 Group Title
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    hmmmmm but two values

    • 2 years ago
  27. amruta1997 Group Title
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    which one to select

    • 2 years ago
  28. amruta1997 Group Title
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    u plz try it once

    • 2 years ago
  29. sauravshakya Group Title
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    well, sin 18 lies in first quadrant so take positive value

    • 2 years ago
  30. amruta1997 Group Title
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    hmmmmm

    • 2 years ago
  31. amruta1997 Group Title
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    good

    • 2 years ago
  32. gohangoku58 Group Title
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    u'll get a cubic equation, with one root = 0 (can't be, rejected) and 2 other roots.....from which u select one with positive value..... like saura said...

    • 2 years ago
  33. amruta1997 Group Title
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    i failed 2 use common sence

    • 2 years ago
  34. amruta1997 Group Title
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    no not a cubic but a quadratic u try it

    • 2 years ago
  35. amruta1997 Group Title
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    i tried it jjust now

    • 2 years ago
  36. gohangoku58 Group Title
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    sin 3x= ?

    • 2 years ago
  37. amruta1997 Group Title
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    3sinx-4 sin cube x

    • 2 years ago
  38. gohangoku58 Group Title
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    3sinx-4 sin cube x<----cubic

    • 2 years ago
  39. amruta1997 Group Title
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    no but sin 2 x is also there

    • 2 years ago
  40. gohangoku58 Group Title
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    *cos 2x

    • 2 years ago
  41. amruta1997 Group Title
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    ya

    • 2 years ago
  42. amruta1997 Group Title
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    1-2sin square x

    • 2 years ago
  43. amruta1997 Group Title
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    then we can take sin in common

    • 2 years ago
  44. sauravshakya Group Title
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    no u cant 1 is there

    • 2 years ago
  45. amruta1997 Group Title
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    r u there on facebook

    • 2 years ago
  46. gohangoku58 Group Title
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    who ?

    • 2 years ago
  47. amruta1997 Group Title
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    sorry for the personal Q

    • 2 years ago
  48. gohangoku58 Group Title
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    we both are there...

    • 2 years ago
  49. amruta1997 Group Title
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    all of u

    • 2 years ago
  50. sauravshakya Group Title
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    |dw:1353245978780:dw|

    • 2 years ago
  51. amruta1997 Group Title
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    may i know ur id's

    • 2 years ago
  52. amruta1997 Group Title
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    we can contact there also

    • 2 years ago
  53. amruta1997 Group Title
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    saura i will tell u wait

    • 2 years ago
  54. gohangoku58 Group Title
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    what say saura ?

    • 2 years ago
  55. amruta1997 Group Title
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    short form

    • 2 years ago
  56. gohangoku58 Group Title
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    4 x^3 - 2 x^2 - 3x + 1 = 0 one root is x=1 which can't be.... i made a typo earlier and wrote that one root is 0

    • 2 years ago
  57. amruta1997 Group Title
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    one moment plzz

    • 2 years ago
  58. amruta1997 Group Title
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    2 theta=90-3 theta

    • 2 years ago
  59. amruta1997 Group Title
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    sin 2 theta = cos 3 theta.................sin (90-theta)=costheta

    • 2 years ago
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