$\left(1-x\right)\left(x+y\right)$
$\int x^3\cdot e^{-\frac{hx}{kt}}dx$
$\left|-2\right|\cdot\left|-29\right|$
$172,52+13,73$
$\sec^2a\:sen^2+1=sec^2a$
$2=\frac{3x-1}{x-2}$
$\left(-4x-3y+9\right)^2$
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