indefinite-integration

Question: $\int{{{\cos }^{-1}}\left( \frac{1}{x} \right)\,\,dx}$

1) $x{{\sec }^{-1}}x+{{\cosh }^{-1}}x+C$

2) $x{{\sec }^{-1}}x-{{\cosh }^{-1}}x+C$

3) $x{{\sec }^{-1}}x-{{\sin }^{-1}}x+C$

4) None of these

Solution:

Explanation: No Explanation

Integration by parts

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