sin4x=4sinxcos³x-4cosxsin³x prove that
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Answer:
Step-by-step explanation:
sin(4x)= sin2(2x) =2sin2xcos2x
=2{2sinx.cosx(cos^2 x-sin^2x) }
=2{2sinx.cos³x-2sin³x.cosx}
=4sinxcos³x-4cosxsin³x
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