Which of the following are identities? 1. sin (½ + x) = sin -sin x II. sin (x - 2) = sinx - sin 그플 III. sin (½ + x) = + x) = cos IV. sin (2-x) = = cos x

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A: The given trigonometric expression is

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A:

Q: Express cos (a) in terms of cos(2a). Express sin (a) in terms of cos(2a). cos² (a) COS sin (a)

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A:

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Q: Cot Co 2. Verify cot² (0) - csc² (0) = -1

A: