CUET Preparation Today
Find x if cos x = $-\frac{1}{2}$ |
$\frac{3\pi}{2}$ $\frac{2\pi}{3}$ $\frac{5\pi}{2}$ $\frac{4\pi}{3}$ |
$\frac{2\pi}{3}$ |
cos x = - \(\frac{1 }{2}\) We know, cos 60º = \(\frac{1 }{2}\) and 60º = \(\frac{π}{3}\) but in question cosx is negative . So, x = π - \(\frac{π}{3}\) = \(\frac{2π}{3}\) |
