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  • Prove the following (sinx-siny/cosx+cosy) = tan((x-y)/2)

Q (18) Prove the following

\small \frac{\sin x - \sin y}{\cos x+\cos y} = \tan \frac{(x-y)}{2}

Answers (1)

We know that

\sin x - \sin y = 2\cos\frac{x+y}{2 }\sin\frac{x-y}{2}\\and \\ \\ \cos x +\cos y = 2\cos\frac{x+y}{2 }\cos\frac{x-y}{2}\\

We use these identities 

\\ We \ use \ these \ identities\\ \\ \frac{\sin x - \sin y}{\cos x +\cos y} =\frac{2\cos\frac{x+y}{2 }\sin\frac{x-y}{2}}{ 2\cos\frac{x+y}{2 }\cos\frac{x-y}{2}} = \frac{\sin\frac{x-y}{2}}{\cos\frac{x-y}{2}} = \tan \frac{x-y}{2}

R.H.S.

Posted by

Safeer PP

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