cos(sin^(-1)(-(1)/(2)))+tan^(-1)(cos(\pi ))
cos pi = -1
tan-1 (-1) = 135 degrees
sin-1/2 (-1/2) = -30 or 210 degrees
The , remember this identity: cos(α+β)=cosαcosβ−sinαsinβ and apply it to the following:
cos ( -30 + 135) cos ( 210 + 135)
\(cos(asin\frac{-1}{2})+atan(cos(\pi ))\\ =cos(2\pi-\frac{\pi}{6})+atan(-1)\\ =cos(\frac{\pi}{6})+\frac{-\pi}{4}\\ =\frac{\sqrt3}{2}-\frac{\pi}{4}\\ =\frac{2\sqrt3-\pi}{4}\\\)
