Question: Prove the given identities. tan(90 + x) = cot x [Explain why Eq. (20.13) cannot be used for this, but Eqs. (20.9) and (20.10) can

Prove the given identities.

tan(90° + x) = −cot x [Explain why Eq. (20.13) cannot be used for this, but Eqs. (20.9) and (20.10) can be used.]

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