x^2-1=x+1
x^2-x-2=0
(x-2)(x+1)=0
x=-1或2
面积=∫(-1,2) (x+1)-(x^2-1) dx
=∫(-1,2) x-x^2+2 dx
=x^2/2-x^3/3+2x |(-1,2)
=2-8/3+4-1/2-1/3+2
=9/2 x^2-1=x+1
x^2-x-2=0
(x-2)(x+1)=0
x=-1或2
面积=∫(-1,2) (x+1)-(x^2-1) dx
=∫(-1,2) x-x^2+2 dx
=x^2/2-x^3/3+2x |(-1,2)
=2-8/3+4-1/2-1/3+2
=9/2