Practicing Success
The value of $\frac{9}{4} \sin^{-1}\frac{2\sqrt{2}}{3} + \frac{9}{4} \sin^{-1}\frac{1}{3}$ is : |
$\frac{9}{4}$ $\frac{9 \pi}{4}$ $\frac{\pi}{8}$ $\frac{9 \pi}{8}$ |
$\frac{9 \pi}{8}$ |
$\frac{9}{4} \sin^{-1}\frac{2\sqrt{2}}{3} + \frac{9}{4} \sin^{-1}\frac{1}{3}$ we know that for triangle $A = \sin^{-1} \frac{2\sqrt{2}}{3}$ $B = \sin^{-1}\frac{1}{3}$ so $(A + B) = \frac{\pi}{2} ⇒ \sin^{-1}\frac{2\sqrt{2}}{3} + \sin^{-1}\frac{1}{3} = \frac{\pi}{2}$ $\frac{9}{4} \sin^{-1}\frac{2\sqrt{2}}{3} + \frac{9}{4} \sin^{-1}\frac{1}{3} = \frac{9 \pi}{8}$ |