f(x) = (x)/[(x^2 + 4)]
Locate all inflection points
I got f'(x) = (-x^2 + 4)/[(x^2 +4)]^2
and found f''(x) = [2x(x^4 - 8x^2 - 48)]/[(x^2+4)^4]
x = 0, 4i, some other number
I'm sure theres an easier way of finding the second derivative, any help guys?