KcetInverse Trigonometric FunctionsKCET 2017MCQ+1 / -02017If $\tan ^{-1} x+\tan ^{-1} y=\frac{4 \pi}{5}$, then $\cot ^{-1} x+\cot ^{-1} y$ is equal toA$\frac{2 \pi}{5}$B $\frac{\pi}{5}$C$\frac{3 \pi}{5}$D $\pi$Check AnswerClear SelectionReveal AnswerShow Explanation