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  4. cos (2 tan-1 ( (1/5) )) =

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Q. $\cos (2 \tan^{-1} ( \frac{1}{5} )) = $

Inverse Trigonometric Functions

Solution:

$2 \tan^{-1} x = \cos^{-1} \left(\frac{1-x^{2}}{1+x^{2}}\right)$