y=x^2与y=x^1/2
交点为(0,0)(1,1)
所以
体积=π∫(0,1)(x^1/2)²dx-π∫(0,1)(x²)²dx
=π/2x²|(0,1)-π/5 x^5|(0,1)
=π/2-π/5
=3π/10