Question Number 115253 by aye48 last updated on 24/Sep/20

Express sin 4x interm of sin x.

Answered by Dwaipayan Shikari last updated on 24/Sep/20

sin4x=2sin2xcos2x  =2sinxcosx(1−2sin^2 x)  =2sinx(√(1−sin^2 x)) (1−2sin^2 x)