Find the range of f(x)=4x−2x4x+2xf(x) = \frac{4^x - 2^x}{4^x + 2^x}f(x)=4x+2x4x−2x for x∈Rx \in \mathbb{R}x∈R.
(-1, 1)
[0, 1)
(-1, 0]
(0, 1)