原式=∫arcsinxdx²/2
=x²/2 ·arcsinx- 1/2 ∫x²darcsinx
=x²/2 ·arcsinx- 1/2 ∫x²/√(1-x²)dx
=x²/2 ·arcsinx+1/2 ∫(1-x²-1)/√(1-x²)dx
=x²/2 ·arcsinx+1/2 ∫√(1-x²)dx-1/2∫1√(1-x²)dx
=x²/2 ·arcsinx+1/4arcsinx+1/4x√(1-x²)-1/2arcsinx+c
=x²/2 ·arcsinx-1/4arcsinx+1/4x√(1-x²)+c