$z\:+\:\left(z\:+\:6\right)$
$\int\:3x^3e^{3x}dx$
$\lim_{x\to0}\left(\frac{cosm\left(x\right)-\cos n\left(x\right)}{x^2}\right)$
$\left(\frac{2^5}{2^2}\right)^4$
$-\left(4-2\left(3-5\right)\right)$
$\frac{1}{x^2+x}=\frac{4}{x^2+x}$
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