In Exercises 1151, prove the identity.sec2 u - 1 sin u =
Chapter 5, Problem 5.1.1.134(choose chapter or problem)
In Exercises 11–51, prove the identity.
\(\frac{\sec ^{2} \theta-1}{\sin \theta}=\frac{\sin \theta}{1-\sin ^{2} \theta}\)
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