$\lim_{x\to4}\frac{x-4}{x^2-x+12}$
$\int\frac{x^2}{\sqrt{4\:+x\:^2}}dx$
$\int x\left(e^{x^4}\right)dx$
$\:7,85\:+\:\:1,01$
$\lim_{h\to0}\left(\frac{\left(a+h\right)^n-a^n}{h}\right)$
$\left(xy-6z\right)\cdot\left(xy+6z\right)$
$\left(5n-5\right)\left(2+2n\right)$
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