Derive Triple angle trigonometric formula sin3x from Compound Angle

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I have been stuck on proving this for an hour, THANK YOU!

danielnuncio
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Why didn’t you use 1-2sine^2A, You use 1- sin^2A Instead to replace the cos and thats not whats in the identity you provided.?

anushca
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Thank you so much, I have an exam in 4 days 😂

yinyang