Question: I need help with my assignment. 5. Prove the identities: a) cot2 x - cos2 x = cos2 x cot2 x b) sin(x+y) -= cot

I need help with my assignment.

5. Prove the identities: a) cot2 x - cos2 x = cos2 x cot2 x b) sin(x+y) -= cot x + coty sin x sin y
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