[填空题]
Consider the functionskkh4he z3 ilvtd(p8n(4 .ghu6t* vyd(g6ax m t)jz 9/g.d-spx f, g , defined for $x \in \mathbb{R}$ , given by $f(x)=e^{2 x} \sin x$ and $g(x)=e^{2 x} \cos x$ .
1. Find
a.f ′(x):
b.g ′(x).
$\text { 2. Hence, or otherwise, find } \int_{0}^{\pi} e^{2 x} \cos x \mathrm{~d} x \text {. }$
