The value of $\sin \left[2 \cot ^{-1}\left(\frac{-5}{12}\right)\right]$ is :
Answer & explanation
Correct answer: option 2
$\sin \left(2 \cot ^{-1} (\frac{-5}{12})\right)$
Let $\theta=\cot ^{-1}(-5 / 12)$
so $\cot \theta=\frac{-5}{12}$
$\sin \theta=\frac{12}{13}$
$\cos \theta=\frac{-5}{13}$
$\sin (2 \theta)$
$=2 \sin \theta \cos \theta$
$=\frac{12}{13} \times \frac{-5}{13} \times 2$
$=\frac{-120}{169}$
Option: 2