JEE Math Practice Question
The integral $$\int\limits_{1 / 4}^{3 / 4} \cos \left(2 \cot ^{-1} \sqrt{\frac{1-x}{1+x}}\right) d x$$ is equal to
- A.$$-1/2$$
- B.$$-1/4$$
- C.1/4
- D.1/2
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