$3p-5q-6r+2p+3q-2r-12p+4q$

$\left(cos\:x\:-\:sin\:x\right)^2$

$\frac{dy}{dx}+\sin\left(x+y\right)=0$

$\left(4-\frac{8}{2}\right)-\frac{\left(9-12\right)}{3}$

$\left(\frac{30x^3-18x^2}{6x^3+5x^2}\right)\left(\frac{42x+35}{60x-36}\right)$

$\frac{d}{dx}_{-\sqrt{x}}+\frac{1}{\sqrt{x}}$

$\frac{x^4+2x^3-10}{x-3}$