During \[\cos ({{\tan }^{-1}}x)=\] [MP PET 1988; MNR 1981]

1.	During \[\cos ({{\tan }^{-1}}x)=\] [MP PET 1988; MNR 1981]
A.	\[\sqrt{1+{{x}^{2}}}\]
B.	\[\frac{1}{\sqrt{1+{{x}^{2}}}}\]
C.	\[1+{{x}^{2}}\]
D.	None of these
Answer» C. \[1+{{x}^{2}}\]

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During \[\cos ({{\tan }^{-1}}x)=\] [MP PET 1988; MNR 1981]

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