$u^2+4u+4$

$24a-16b+3c-8b+7a+5c+23b+14a-7c-16a-2c$

$\lim_{x\to0}\left(x\cdot ln\left(sinx\right)\right)$

$\lim_{x\to-3.5}\frac{\tan\left(x+3\right)}{x+3}$

$1\:+-3x+2$

$\left(3y^2\:+\:y^3-2y-1\right)+\left(y^2+2y\right)+\:\left(x^2-13y\right)$

$\frac{2x^3y^8}{12xy^2}$