Evaluate: `inttan^(-1){sqrt(((1-cosx)/(2+cos2x)))}`

Explanation

`int tan^(-1){sqrt(((1-cos2x)/(1+cos2x)))}dx`
`=int tan^(-1){sqrt((2 sin^(2)x)/(2cos^(2)x))}dx`
`=int tan^(-1)(tan x)dx=int xdx=(x^(2))/(2)+C`