$6\cdot2+9-2$
$\frac{8x^2+13x}{\left(x^2+2\right)^2}$
$\int_{-1}^1\left(e^{-2x-1}\right)dx$
$\left(-8\right)^{2.200}$
$\left(x+y+1\right)^3-\left(x+y\right)^3$
$4tan\:x\:-3\:=\:-5$
$\:\:\left(2x+5y^2\right)\left(2x-5y^2\right)$
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