1=sinx
x=π/2
1.s=∫(0,π/2) (1-sinx)dx
=(x+cosx)|(0,π/2)
=(π/2-cos0)
=π/2-1
2.v=π∫(0,π/2)(1-sin²x)dx
=π∫(0,π/2)(cos²x)dx
=π·1/2·π/2
=π²/4