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CBSE Class 11-science Answered

sin 3x + sin 2x - sin x = 4 sin x cos x/2 cos 3x/2
Asked by haroonrashidgkp | 20 Dec, 2017, 11:35: AM
answered-by-expert Expert Answer
begin mathsize 16px style sin 3 straight x plus sin 2 straight x minus sinx equals sin 3 straight x minus sinx plus sin 2 straight x equals 2 cos 2 xsinx plus 2 sinxcosx equals 2 sinx left parenthesis cos 2 straight x plus cosx right parenthesis equals 2 sinx open parentheses 2 cos open parentheses fraction numerator 3 straight x over denominator 2 end fraction close parentheses cos open parentheses straight x over 2 close parentheses close parentheses equals 4 sinx cos open parentheses fraction numerator 3 straight x over denominator 2 end fraction close parentheses cos open parentheses straight x over 2 close parentheses end style
Answered by Sneha shidid | 20 Dec, 2017, 11:47: AM

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CBSE 11-science - Maths
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