f(x)=x^2 ,0≤x≤1
=2x+1 ,12)f(x)dx
=∫(0->1)f(x)dx + ∫(1->2)f(x)dx
=∫(0->1)x^2dx + ∫(1->2)(2x+1)dx
= [x^3/3](0->1) + [x^2+x](1->2)
=1/3 + (4+2-1-1)
=13/3