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fawad114

prove THAT sin3x=cos3x

  • 11 months ago
  • 11 months ago

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  1. .Sam.
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    Start by \[\sin(3x)=\sin(2x+x)\] Then use the sum to difference formula

    • 11 months ago
  2. Shadowys
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    are there any values setfor this question? sin 3x = cos 3x only when tan 3x =1

    • 11 months ago
  3. fawad114
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    but not a complete answer

    • 11 months ago
  4. fawad114
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    wrong SHADOWYS

    • 11 months ago
  5. Shadowys
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    oh. okay. sub x=0 into the eq and see what u get

    • 11 months ago
  6. fawad114
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    X is a angle not a variable

    • 11 months ago
  7. Shadowys
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    In this case, since the question is asking for the [[proof]], not the solution, i don't see how you can get it, without setting the angles into set angles, like \(\frac{\pi}{12}\) rad

    • 11 months ago
  8. fawad114
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    i can give you a hint..!

    • 11 months ago
  9. Shadowys
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    in the case where you need the solution, sin 3x = sin (90-3x) and use the general formula, \(3x=n\pi + (-1)^n (90-3x)\)

    • 11 months ago
  10. Shadowys
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    that is the solution, not the proof though. So i don't think I gave any help into solving that question. note: \(n \in N\)

    • 11 months ago
  11. moli1993
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    u wanna calculate the value of x ?

    • 11 months ago
  12. fawad114
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    just find the vale of "X"

    • 11 months ago
  13. Best_Mathematician
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    sin 45 = cos 45 sin(3*15) = cos(3*15) so x=15 thus sin3x=cos3x your welcome

    • 11 months ago
  14. fawad114
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    thanks

    • 11 months ago
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