Question

The principal value of sin^–1$\left\lbrack \sin\left( \frac{2\pi}{3} \right) \right\rbrack$ is-

• A. –$\frac{2\pi}{3}$
• B. $\frac{2\pi}{3}$
• C. $\frac{4\pi}{3}$
• D. None of these

Answer 1

Answer: (D)

None of these

Answer 2

sin^–1$\left\lbrack \sin(\pi - 2\pi/3) \right\rbrack$= sin^–1 sin (p/3) = p/3