Question 2 - A-Level Maths

Using integration by parts, find the indefinite integral, with respect to $x$, of $$x \cos x$$
Using the substitution $u ^ { 2 } = 2 x + 1$, find the indefinite integral, with respect to $$x , \text { of } \frac { 6 x } { \sqrt { 2 x + 1 } } .$$