$\int e^{-b}\:db$
$\frac{sen\left(x\right)+\csc\left(x\right)}{sen\left(x\right)}=1-\frac{1}{tan\left(x\right)}$
$\int\left(\frac{1}{\sqrt{x^2-16x+65}}\right)dx$
$-\frac{v}{5}\ge7.2$
$10ab-7ab-3ab-10ab$
$5x-4<3x+5$
$\left(y_{2}-3.6\right)\left(y_{2}+4.7\right)$
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