\[\cos \left[ 2{{\cos }^{-1}}\frac{1}{5}+{{\sin }^{-1}}\frac{1}{5} \right]=\] [IIT 1981]

\[\cos \left[ 2{{\cos }^{-1}}\frac{1}{5}+{{\sin }^{-1}}\frac{1}{5} \ri

1.	\[\cos \left[ 2{{\cos }^{-1}}\frac{1}{5}+{{\sin }^{-1}}\frac{1}{5} \right]=\] [IIT 1981]
A.	\[\frac{2\sqrt{6}}{5}\]
B.	\[-\frac{2\sqrt{6}}{5}\]
C.	\[\frac{1}{5}\]
D.	\[-\frac{1}{5}\]
Answer» C. \[\frac{1}{5}\]

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\[\cos \left[ 2{{\cos }^{-1}}\frac{1}{5}+{{\sin }^{-1}}\frac{1}{5} \right]=\] [IIT 1981]

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