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Prove the Identity sec⁡(π2+u)=−csc⁡u\sec \left( \frac { \pi } { 2 } + u \right) = - \csc u

Question 291

Essay

Prove the identity.
- sec⁡(π2+u)=−csc⁡u\sec \left( \frac { \pi } { 2 } + u \right) = - \csc u

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