$\cos \left[{\cos }^{-1}\left(- \frac{1 }{7}\right) + {\sin }^{-1}\left(- \frac{1}{7}\right)\right] \mathrm{is} \mathrm{equal} \mathrm{to}$

• $- \frac{1}{3}$

• 0

• $\frac{1}{3}$

• $\frac{4}{9}$

$\mathrm{If} {\sin }^{-1}\left(\mathrm{x}\right) + {\sin }^{-1}\left(1 - \mathrm{x}\right) = {\cos }^{-1}\left(\mathrm{x}\right), \mathrm{then} \mathrm{x} \in \mathrm{to}$

• {1, 0}

• {- 1, 1}

• $\left\{0, \frac{1}{2}\right\}$

• {2, 0}

${\sin }^{-1}\left(\frac{4}{5}\right) + 2{\tan }^{-1}\left(\frac{1}{3}\right)$ is equal to

• $\frac{\mathrm{\pi }}{3}$

• $\frac{\mathrm{\pi }}{4}$

• $\frac{\mathrm{\pi }}{2}$

• 0

$2{\tanh }^{-1}\left(\frac{1}{2}\right)$ is equal to

• 0

• log(2)

• log(3)

• log(4)

The cartesian form of the polar equation $\mathrm{\theta } = {\tan }^{-1}\left(2\right) \mathrm{is}$

• x = 2y

• y = 2x

• x = 4y

• y = 4x

$$\begin{gathered} \mathrm{The} \mathrm{value} \mathrm{of} \mathrm{x}, \mathrm{where} \mathrm{x} > 0 \\ \mathrm{and} \tan \left({\sec }^{ - 1}\left(\frac{1}{\mathrm{x}}\right)\right) = \sin \left({\tan }^{-1}\left(2\right)\right) \mathrm{is} \end{gathered}$$

• $\sqrt{5}$

• $\frac{\sqrt{5}}{3}$

• 1

• $\raisebox{1ex}{$2$}\!\left/ \!\raisebox{-1ex}{$3$}\right.$

$\mathrm{If} {\sin }^{-1}\left(\frac{3}{\mathrm{x}}\right) + {\sin }^{-1}\left(\frac{4}{\mathrm{x}}\right) = \frac{\mathrm{\pi }}{2}, \mathrm{then} \mathrm{x} = ?$

• 3

• 5

• 7

• 11

178.

${\cos }^{-1}\left(\frac{- 1}{2}\right) - 2{\sin }^{-1}\left(\frac{1}{2}\right) +3{\cos }^{-1}\left(\frac{- 1}{\sqrt{2}}\right) - 4{\tan }^{-1}\left(- 1\right) = ?$

• $\frac{19\mathrm{\pi }}{12}$

• $\frac{35\mathrm{\pi }}{12}$

• $\frac{47\mathrm{\pi }}{12}$

• $\frac{43\mathrm{\pi }}{12}$

${\sinh }^{-1}\left(2\right) + {\sinh }^{-1}\left(3\right) = \mathrm{x} \Rightarrow \cosh \left(\mathrm{x}\right) = ?$

• $\frac{1}{2}\left(3\sqrt{5} + 2\sqrt{10}\right)$

• $\frac{1}{2}\left(3\sqrt{5} - 2\sqrt{10}\right)$

• $\frac{1}{2}\left(12 + 2\sqrt{50}\right)$

• $\frac{1}{2}\left(12 - 2\sqrt{50}\right)$

$\mathrm{In} \mathrm{any} ∆\mathrm{ABC}, \mathrm{a}\left(\mathrm{bcos}\left(\mathrm{C}\right) - \mathrm{ccos}\left(\mathrm{B}\right)\right) = ?$

• b² + c²

• b² - c²

• $\frac{1}{\mathrm{b}} + \frac{1}{\mathrm{c}}$

• $\frac{1}{{\mathrm{b}}^2} - \frac{1}{{\mathrm{c}}^2}$