In Exercises 1151, prove the identity.2 tan x 1 - tan2 x +
Chapter 5, Problem 5.1.1.163(choose chapter or problem)
In Exercises 11–51, prove the identity.
\(\frac{2 \tan x}{1-\tan ^{2} x}+\frac{1}{2 \cos ^{2} x-1}=\frac{\cos x+\sin x}{\cos x-\sin x}\)
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