Differentieer:
$\eqalign{ & 1.\,\,\,f(x) = x^3 \cdot e^{x^2 } \cr & 2.\,\,\,f(x) = e^{\sin 2x} \cr & 3.\,\,\,f(x) = \frac{{2e^x - 3}}{{e^x + 1}} \cr} $