Trig-e

Calculus Level 3

$\large \int\cos(2x) \sin(5x) \, dx= \, ?$

\frac{1}{2} \, \sin(3x) + \frac{1}{2} \, \sin(7x)

-\frac{1}{2} \, \sin(2x) - \frac{1}{5} \, \sin(5x)

\frac{1}{10} ( \sin(2x) \, \cos(5x) - \cos(2x) \, \sin(5x) )

-\frac{1}{6} \, \cos(3x) - \frac{1}{14} \, \cos(7x)