Tìm nguyên hàm của hàm số \(f\left( x \right) = \sqrt {3x + 2}\).
A. \(\int {f\left( x \right)} = \frac{2}{3}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
B. \(\int {f\left( x \right)} = \frac{2}{9}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
C. \(\int {f\left( x \right)} = \frac{1}{3}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
D. \(\int {f\left( x \right)} = \frac{3}{2}.\frac{1}{{\sqrt {3x + 2} }} + c\)
A. \(\int {f\left( x \right)} = \frac{2}{3}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
B. \(\int {f\left( x \right)} = \frac{2}{9}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
C. \(\int {f\left( x \right)} = \frac{1}{3}\left( {3x + 2} \right)\sqrt {3x + 2} + c\)
D. \(\int {f\left( x \right)} = \frac{3}{2}.\frac{1}{{\sqrt {3x + 2} }} + c\)