1.) Without evaluating the integrals, prove that the following areas under the function's curves are equal:

$\displaystyle f(x) = \frac{x}{(1+x^4)}$ on the interval of 0 to 2

and

$\displaystyle g(x) = \frac{1}{2(1+x^2)}\$ on the interval of 0 to 4

I've no idea where to start on this one... not without evaluating integrals. I do have their graphs to look at, but I'm not seeing anything obvious. Any help is appreciated...