$c=\left(\sqrt{8}+\sqrt{5}\right)\left(\sqrt{8}-\sqrt{5}\right)$
$\frac{1}{x}+\frac{1}{x+2}=\frac{1}{5}$
$6\:\cos \theta-3=0$
$\int z^2\ln\left(z\right)dz$
$\frac{x^{-7}\cdot x^3}{x^5}$
$\left(2x-12y\right)-\left(-9y+35+4x\right)$
$20,25\cdot30,0067$
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