What is the value of $2\sin^{-1}\left(\frac{1}{2}\right) + \cos^{-1}\left(-\frac{1}{2}\right)$?

Explanation

1. 01

   $2 \times \frac{\pi}{6} = \frac{\pi}{3}$ and $\cos^{-1}\left(-\frac{1}{2}\right) = \frac{2\pi}{3}$.

2. 02

   $\frac{\pi}{3} + \frac{2\pi}{3} = \pi$.