$\left(8x^2y^3z+3x^2y+6xy\right)\left(3x^2y\right)$
$3x+2x+5x$
$9ab-15ab$
$\frac{d}{dy}\frac{x+2}{5x+8}$
$\frac{3}{5}\left(10y-5\right)$
$\int\:\frac{\left(x^7\right)}{\sqrt[6]{9-x^4}}dx$
$\frac{tg^2a}{1-\cos^2a}-\frac{1}{\sec^2a}=1$
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