f(x) = (x² - x) / (x² + 1)
Max: (-1 - sqrt(2), f(-1 - sqrt(2)))
min: (-1 + sqrt(2), f(-1 + sqrt(2)))
I1 = (1, 0)
I2 = (-3.73, 1.183)
I3 = (-0.268, 0.317)