\[{{\cos }^{-1}}\left( \frac{15}{17} \right)+2{{\tan }^{-1}}\left( \frac{1}{5} \right)=\] [EAMCET 1981]

\[{{\cos }^{-1}}\left( \frac{171}{221} \right)\]

\[{{\cos }^{-1}}\left( \frac{15}{17} \right)+2{{\tan }^{-1}}\left( \fr

1.	\[{{\cos }^{-1}}\left( \frac{15}{17} \right)+2{{\tan }^{-1}}\left( \frac{1}{5} \right)=\] [EAMCET 1981]
A.	\[\frac{\pi }{2}\]
B.	\[{{\cos }^{-1}}\left( \frac{171}{221} \right)\]
C.	\[\frac{\pi }{4}\]
D.	None of these
Answer» E.

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\[{{\cos }^{-1}}\left( \frac{15}{17} \right)+2{{\tan }^{-1}}\left( \frac{1}{5} \right)=\] [EAMCET 1981]

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