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Establish the identity cos x cos y sin x sin y O A Which of the choices shows the key steps that can be used to verify the identity x y x y 2 x y 2 x y 2 2 sin x sin y B cot O C cos x cos y sin x sin y cos x cos y sin x sin y x y 2 cos x cos y sin x sin y 2 cos x y 2 sin x sin y 2 sin COS 2 cos sin x y 2 sin x sin y x y 2 COS x y 2 2 cos 2 sin 2 sin 2 sin 2 sin x y 2 x y 2 2 cos x y 2 COS sin x y 2 COS COS x y 2 x y 2 x y 2 x y 2 COS COS cot x y 2 cot x y 2 x y 2 x y 2 cot x y 2
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