$\int\left(-3xe^{3x}\right)dx$

$d-1<-6$

$1-xg+x^{x}0z$

$\left(84+75+76\right)-\left(64+58\right)-52$

$\lim_{x\to0}\left(\frac{3x^2}{\tan x^2}\right)$

$2x^2\:+\:y^2\:-\:x\:+\:\:y\:+3y^2\:+\:x-\:x^2+\:x\:-2y\:+\:x^2\:4y^2$

$\lim_{x\to-3}\left(\frac{x^3+27}{x^2+4x-21}\right)$