Question

alguem pode me ajudar integral cos (6x)dx

Answer 1

$\int\limits {cos(6x)} \, dx$
$u=6x$
$du=6dx$
$dx=\frac{du}{6}$
$\int\limits {\frac{cos(u)}{6}} \, du$
$\frac16 \int\limits {cos(u)} \, du$
$\frac16sin(u)+C$
$\boxed{\frac{sin(6x)}{6}+C}$