$cos\left(25\right)cos\left(65\right)-sin\left(25\right)sin\left(60\right)$

$144m^2-72mp+9p^2$

$\frac{d}{dx}\left(\frac{\left(2cosecx-1\right)}{\left(cosecx+2\right)}\right)$

$5\frac{dy}{dx}+4y=2$

$\frac{dy}{dx}=\frac{y+11}{5x+6}$

$-8+-6-4+-5$

$\left(5x+2y\right)\left(x-2y\right)$