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5 October, 21:48

Simplify the equation using addition or subtraction formula.

sin θ cos 3θ + cos θ sin 3θ = 0

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Answers (1)
  1. 5 October, 21:51
    0
    Hello,

    sin (a+b) = sin a cos b + cos a sin b

    0=sin t cos3t + cos t sin 3t=sin (4t)

    ==>4t=kπ

    ==>t=kπ/4
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