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int sin(x)|sin(x)| dx
= int sin(x) sin(x) dx
= int sin^2 x dx
= int (1 - cos(2x))/2 dx
= int 1/2 - 1/2 cos(2x) dx
= [x/2 - 1/4 sin(2x)]
tinggal ngitung batasnya
F(pi) - F(0)
= [pi/2 - 1/4 sin(2pi)] - [0/2 - 1/4 sin(0)]
= pi/2 - 0 - (0 - 0)
= pi/2