Question: Establish identity. 1 - cot? 0 1 + cot? 0 + 2 cos? 0 = 1

Establish identity.

1 - cot? 0 1 + cot? 0 + 2 cos? 0 = 1

1 - cot? 0 1 + cot? 0 + 2 cos? 0 = 1

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