$\int\sqrt{2+x}dx$
$\left(3a-3\right)\left(3a^3-3a^2+3a-1\right)$
$cos\:2\:x\:-\:senx\:=\:1$
$e^{-ax}e^{-x}$
$sin^2x+4cos^2x$
$\int\frac{x}{\sqrt[2]{-6x+x^2}}dx$
$15x^2-6x+5$
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