Indefinite Integration

$\frac{x^m \sin n x}{n}+\frac{m(m-1) x^{m-1} \cos n x}{n^2}$

$\frac{x^m \cos n x}{n}+\frac{x^{m-1} m(m-1)}{n^2} \sin n x$

$\frac{m}{n} \sin n x+\frac{m}{n^2} x^{m-1} \cos n x$

$\frac{x^m \sin n x}{n}+\frac{m}{n^2} x^{m-1} \cos n x$