Tìm: a)nguyên hàm (2cosx + 3/ căn x); b)nguyên hàm (3canx - 4sinx)

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

                                     = 2sinx + 6\(\sqrt x \) + C.

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

                                     = \(2x\sqrt x + 4\cos x + C.\)