MCQ
${\sin ^{ - 1}}\frac{1}{{\sqrt 5 }} + {\cot ^{ - 1}}3 = . . ..$
- A$\frac{\pi }{6}$
- ✓$\frac{\pi }{4}$
- C$\frac{\pi }{3}$
- D$\frac{\pi }{2}$
$ = {\cot ^{ - 1}}(2) + {\cot ^{ - 1}}(3) = {\cot ^{ - 1}}\left( {\frac{{2 \times 3 - 1}}{{3 + 2}}} \right) = {\cot ^{ - 1}}(1) = \frac{\pi }{4}$.
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