let
f(t)dt = dF(t)
∫(0->x^2-1) f(t) dt=2x
F(x^2-1) - F(0) = 2x
[F(x^2-1) - F(0)]' = [2x]'
2xf(x^2-1) = 2
put x=2
4f(3)=2
f(3) = 1/2
let
f(t)dt = dF(t)
∫(0->x^2-1) f(t) dt=2x
F(x^2-1) - F(0) = 2x
[F(x^2-1) - F(0)]' = [2x]'
2xf(x^2-1) = 2
put x=2
4f(3)=2
f(3) = 1/2