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Prove that (cos x +cos y)^(2)+(sin x-sin...

Prove that `(cos x +cos y)^(2)+(sin x-sin y)^(2)=4 cos^(2) ((x+y)/(2))`

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OSWAAL PUBLICATION-SAMPLE PAPER 5-EXERCISE
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  3. Prove that (cos x +cos y)^(2)+(sin x-sin y)^(2)=4 cos^(2) ((x+y)/(2))

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  4. Solve the equation x^2+3x+9=0.

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