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cos(x + y) = (A) cosx + cosy (B) cosx cosy - sinx siny

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\(\cos (x+y)=\)

(A) \(\cos x+\cos y\)

(B) \(\cos x \cos y-\sin x \sin y\)

(C) \(\cos x \cos y+\sin x \sin y\)

(D) \(\cos x-\sin y\)

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1 Answer

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Best answer

Correct option is (B) \(\cos x \cos y-\sin x \sin y\) 

\(\cos (x+y)=\cos x \cos y-\sin x \sin y\)

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