Calculate ∫ upper π lower 0 √ (1-sinx) DX steps!

Calculate ∫ upper π lower 0 √ (1-sinx) DX steps!

1-SINx=1-2sin(x/2)*cos(x/2)=/sin(x/2)-cos(x/2)/.2=.
The partition 0-45-135-180 lists the expressions
Note that DX = 2D (x / 2), which unifies the angle