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sin x sin y cosx cos y O A Which of the choices shows the key steps that can be used to verify the identity

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sin x sin y cosx cos 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 2 cos x cos y OB cot O C sin x sin y cos x cos y sin x siny cosx cos y sin x sin y cos x cos y x y 2 2 sin 2 sin COS x y 2 cos x cos y 2 sin COS x y 2 x y 2 cos x cos y COS x y 2 2 sin 2 sin 2 sin x y 2 2 sin 2 sin x y 2 2 cos COS x y 2 x y 2 x y 2 sin COS sin COS x y 2 x y 2 x y 2 x y 2 x y 2 COS cot cot x y 2 x y 2 x y 2 cot x y 2

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