$3\left(x\:+\:2\right)^2\:;\:x=1.2$

$\int\sec^2\left(\ln\left(x\right)\right)dx$

$\lim_{x\to a}\left(\frac{x^2-\left(a+1\right)x+a}{x-a}\right)$

$\int\left(x^4-1\right)x^2dx$

$\frac{216\:+x^3y^6}{6\:+\:xy^2}$

$4^540y^3+144y$

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