∫(x^2/√(1 - x^2)) dx=ASIN(x)/2 - x·√(1 - x^2)/2
quindi:
ASIN(√2/2)/2 - √2/2·√(1 - (√2/2)^2)/2 = pi/8 - 1/4
ASIN(0)/2 - 0·√(1 - 0^2)/2 = 0
Quindi:
(pi/8 - 1/4) - 0 = (pi - 2)/8
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