The value of $\sin^{-1}\left(\frac{\sqrt{3}}{2}\right) - \sin^{-1}\left(\frac{1}{2}\right)$ is ....... $^o$.

$\sin^{-1}(\sin \frac{7\pi}{6}) = $

Consider the following statements:
Statement-$I$: $\operatorname{Cosh}^{-1} x = \operatorname{Tanh}^{-1} x$ has no solution.
Statement-$II$: $\operatorname{Cosh}^{-1} x = \operatorname{Coth}^{-1} x$ has only one solution.
The correct answer is:

${\left[ {\sin \left( {{{\tan }^{ - 1}}\frac{3}{4}} \right)} \right]^2} = $

The value of $\tan ^{-1}\left(\tan \frac{7 \pi}{6}\right)$ is

Find the principal value of $\cos ^{-1}\left(-\frac{1}{\sqrt{2}}\right)$.