In Exercises 1151, prove the identity.cos x 1 + sin x + cos x 1 - sin x = 2 sec x
Chapter 5, Problem 5.1.1.162(choose chapter or problem)
In Exercises 11–51, prove the identity.
\(\frac{\cos x}{1+\sin x}+\frac{\cos x}{1-\sin x}=2 \sec x\)
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