∫ xarcsinx dx
= ∫ arcsinx d(x²/2)
= (x²/2)(arcsinx) - (1/2)∫ x²*(arcsinx)' dx
= (x²arcsinx)/2 - (1/2)∫ x²/√(1-x²) dx
令x=siny,dx=cosydy
= (x²arcsinx)/2 - (1/2)∫ sin²y/cosy * cosydy
= (x²arcsinx)/2 - (1/4)∫ (1-cos2y) dy
= (x²arcsinx)/2 - (1/4)(y-1/2*sin2y) + C
= (x²arcsinx)/2 - (1/4)arcsinx - (x/4)√(1-x²) + C
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