Find the range of f(x)=2x2x2+4f(x) = \frac{2x^2}{x^2+4}f(x)=x2+42x2.
[0,2)[0, 2)[0,2)
[0,1)[0, 1)[0,1)
(0,2](0, 2](0,2]
[0,2][0, 2][0,2]