271.

Given $0 \le \mathrm{x} \le \frac{1}{2}$, then the value of $\tan \left[{\sin }^{-1}\left\{\frac{\mathrm{x}}{\sqrt{2}} + \frac{\sqrt{1 - {\mathrm{x}}^2}}{\sqrt{2}}\right\} - {\sin }^{-1}\left(\mathrm{x}\right)\right]$ is

• 1

• $\sqrt{3}$

• - 1

• $\frac{1}{\sqrt{3}}$

The value of $\sin \left(2{\sin }^{-1}\left(0.8\right)\right)$ is equal to

• 0.48

• $\sin \left(1.2°\right)$

• $\sin \left(1.6°\right)$

• 0.96

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

• $\frac{\mathrm{\pi }}{4}$

• $\frac{\mathrm{\pi }}{6}$

• $\frac{2\mathrm{\pi }}{3}$

• $\frac{\mathrm{\pi }}{2}$

Solve for $\mathrm{x} {\tan }^{-1}\left(\frac{1 - \mathrm{x}}{1 + \mathrm{x}}\right) = \frac{1}{2}{\tan }^{-1}\left(\mathrm{x}\right) . \mathrm{x} > 0$

• - 1

• $\sqrt{3}$

• $\frac{1}{\sqrt{3}}$

• 1

If $\frac{{\left(\mathrm{x} + 1\right)}^2}{{\mathrm{x}}^3 + \mathrm{x}} = \frac{\mathrm{A}}{\mathrm{x}} + \frac{\mathrm{Bx} + \mathrm{C}}{{\mathrm{x}}^2 + 1}$, then ${\csc }^{-1}\left(\frac{1}{\mathrm{A}}\right) + {\cot }^{-1}\left(\frac{1}{\mathrm{B}}\right) + {\sec }^{-1}\left(\mathrm{C}\right)$ is equal to

• $\frac{\mathrm{\pi }}{6}$

• $\frac{5\mathrm{\pi }}{6}$

• $\frac{\mathrm{\pi }}{2}$

• 0

If $\mathrm{\alpha } \le 2{\sin }^{-1}\left(\mathrm{x}\right) + {\cos }^{-1}\left(\mathrm{x}\right) \le \mathrm{\beta }$, then

• $\mathrm{\alpha } = 0, \mathrm{\beta } = \mathrm{\pi }$

• $\mathrm{\alpha } = \frac{- \mathrm{\pi }}{2}, \mathrm{\beta } = \frac{\mathrm{\pi }}{2}$

• $\mathrm{\alpha } = 0, \mathrm{\beta } = 2\mathrm{\pi }$

• $\mathrm{\alpha } = \frac{- \mathrm{\pi }}{2}, \mathrm{\beta } = \frac{3\mathrm{\pi }}{2}$

The value of ${\sin }^{-1}\left(\cos \left(\frac{53\mathrm{\pi }}{5}\right)\right)$ is

• $\frac{3\mathrm{\pi }}{5}$

• $\frac{- 3\mathrm{\pi }}{5}$

• $\frac{\mathrm{\pi }}{10}$

• $\frac{- \mathrm{\pi }}{10}$

If $3{\tan }^{-1}\left(\mathrm{x}\right) + {\cot }^{-1}\left(\mathrm{x}\right) = \mathrm{\pi }$, then x is equal to

• 0

• 1

• - 1

• 1/2

The simplified form of ${\tan }^{-1}\left(\frac{\mathrm{x}}{\mathrm{y}}\right) - {\tan }^{-1}\left(\frac{\mathrm{x} - \mathrm{y}}{\mathrm{x} + \mathrm{y}}\right)$ is equal to

• 0

• $\raisebox{1ex}{$\mathrm{\pi }$}\!\left/ \!\raisebox{-1ex}{$4$}\right.$

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

• $\mathrm{\pi }$

If ${\sin }^{-1}\left(\mathrm{x}\right) + {\sin }^{-1}\left(\mathrm{y}\right) = \frac{\mathrm{\pi }}{2}$, then x² is equal to

• 1 - y²

• y²

• 0

• $\sqrt{1 - \mathrm{y}}$