Tìm: a) \(\int {\left( {2\cos x + \frac{3}{{\sqrt x }}} \right)dx} \); b) \(\int {\left( {3\sqrt x - 4\sin x} \right)dx} \).

Tìm:

a) \(\int {\left( {2\cos x + \frac{3}{{\sqrt x }}} \right)dx} \);

b) \(\int {\left( {3\sqrt x - 4\sin x} \right)dx} \).