The integral \( \int \sqrt{\frac{1 - \cos 2x}{1 + \cos 2x}} \, dx \) is equal to :
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The double angle identities \( 1-\cos 2x = 2\sin^2 x \) and \( 1+\cos 2x = 2\cos^2 x \) are highly frequent in calculus. Memorize them to simplify trigonometric roots quickly.