Saved Bookmarks
| 1. |
Find the principal value of each of the following :\(\cos^{-1}\left(\frac{-1}{2}\right)\) |
|
Answer» \(\cos^{-1}\left(\frac{-1}{2}\right)\)\(=\pi-\cos^{-1}\left(\frac{1}{2}\right)\) [ Formula: cos -1(-x) = -cos -1(x) ] \(=\pi-\frac{\pi}{3}=\frac{2\pi}{3}\) |
|