Evaluate : `intsqrt(1-sin2x)dx`.

Explanation

`intsqrt(1-sin2x) dx = int(cos^(2) x + sin^(2)x - 2 sin x cos x)^(1//2) dx`
`= intsqrt((cosx -sinx)^(2))dx`
`= int(cosx - sinx) dx = intcos x dx - int sin xdx`
`= sinx - (-cosx) + C = sin x + cos x + C`.