1.

\[\int{{{\cos }^{-1}}\left( \frac{1}{x} \right)\,\,dx}\]         [RPET 2002]

A.                 \[x{{\sec }^{-1}}x+{{\cosh }^{-1}}x+C\]
B.                 \[x{{\sec }^{-1}}x-{{\cosh }^{-1}}x+C\]
C.                 \[x{{\sec }^{-1}}x-{{\sin }^{-1}}x+C\]
D.                 None of these
Answer» C.                 \[x{{\sec }^{-1}}x-{{\sin }^{-1}}x+C\]


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