# Integration by parts integration xcos3xsen3x please?

• Integration by parts integration xcos3xsen3x please?

Integration by parts. Help please $\int r^{3} \frac{1}{\sqrt{16+r^{2}}} dr$ up vote 0 down vote favorite. ... integration by parts is not really needed here.
Integration by parts. Help please $\int r^{3} \frac{1}{\sqrt{16+r^{2}}} dr$ up vote 0 down vote favorite. ... integration by parts is not really needed here.