简单计算一下即可，答案如图所示
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第1个回答 2020-01-01
换元,t = arcsinx, dx = cost dt
I = ∫ t sin²t dt = (1/2) ∫ t (1﹣cos2t) dt
= (1/4) t² ﹣(t/4)sin2t + (1/4) ∫ sin2t dt
= (1/4) t² ﹣(t/4)sin2t ﹣ (1/8) cos2t + C
= (1/4)arcsin²x ﹣(1/2) x √(1-x²) arcsinx ﹣ (1/8) (1﹣2x²) + C
= (1/4)arcsin²x ﹣(1/2) x √(1-x²) arcsinx + (1/4) x² + C
I = ∫ t sin²t dt = (1/2) ∫ t (1﹣cos2t) dt
= (1/4) t² ﹣(t/4)sin2t + (1/4) ∫ sin2t dt
= (1/4) t² ﹣(t/4)sin2t ﹣ (1/8) cos2t + C
= (1/4)arcsin²x ﹣(1/2) x √(1-x²) arcsinx ﹣ (1/8) (1﹣2x²) + C
= (1/4)arcsin²x ﹣(1/2) x √(1-x²) arcsinx + (1/4) x² + C
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