$3a\:+\:2b\:+4a\:-\:5a$

$-3\left(x-y\right)$

$\int_{-3}^{-1}\left(3x^3+3x^2-36x\right)dx$

$y'+3x^2+y=x^2$

$0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$

$75x^3y^4\left(a^2-b^2\right)-125x^4y^3\left(a^2-b^2\right)$

$\int\left(\cos\left(\frac{1}{3}x-6\right)\right)dx$