MCQ
$\sec ({\rm{cose}}{{\rm{c}}^{ - 1}}x)$ is equal to
- ✓${\rm{cosec}}({\sec ^{ - 1}}x)$
- B$\cot x$
- C$\pi $
- DNone of these
$ = \frac{{|x|}}{{\sqrt {{x^2} - 1} }}$, for $|x|\, > \,1$.
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$(A)$ If $g$ is continuous at $x=1$, then $f g$ is differentiable at $x=1$
$(B)$ If fg is differentiable at $x=1$, then $g$ is continuous at $x=1$
$(C)$ If $g$ is differentiable at $x=1$, then $f g$ is differentiable at $x=1$
$(D)$ If $fg$ is differentiable at $x =1$, then $g$ is differentiable at $x =1$