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# Use the double-angle formula $\cos 2 x=2 \cos ^{2} x-1$ to evaluate the integral $$\int \frac{1}{1+\cos 2 x} d x$$...

## Question

###### Use the double-angle formula $\cos 2 x=2 \cos ^{2} x-1$ to evaluate the integral $$\int \frac{1}{1+\cos 2 x} d x$$

Use the double-angle formula $\cos 2 x=2 \cos ^{2} x-1$ to evaluate the integral $$\int \frac{1}{1+\cos 2 x} d x$$

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