Determine the value of ∫01x2−x41+x2dx\int_0^1 \frac{x^2 - x^4}{1+x^2} dx∫011+x2x2−x4dx using polynomial division or symmetry.
2−π/22 - \pi/22−π/2
π/4−1/3\pi/4 - 1/3π/4−1/3
1−π/41 - \pi/41−π/4
000