MCQ
$\int_{\,0}^{\,1} {\frac{d}{{dx}}\left[ {{{\sin }^{ - 1}}\left( {\frac{{2x}}{{1 + {x^2}}}} \right)} \right]\,dx} $ is equal to
- A$0$
- B$\pi $
- ✓$\pi /2$
- D$\pi /4$
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$I.$ There exists a real number $A$ such that $f(x) \leq A$ for all $x$.
$II.$ There exists a real number $B$ such that $f(x) \geq B$ for all $x$.