Question: Hi help pls 2. Express cost x in first powers of cosine. 3. Simplify the following sec x -1 a). sec x -1 cos x

Hi help pls

Hi help pls 2. Express cost x in first powers of cosine.

2. Express cost x in first powers of cosine. 3. Simplify the following sec x -1 a). sec x -1 cos x b). cos x sin x

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