$3^{-x}=81$
$\int\left(\frac{x^3-2}{e^{5x}}\right)dx$
$2x-\frac{5}{3}>\frac{x}{4}+10$
$\left(x^2+1\right)\cdot cos2x$
$\int\frac{1}{cos\left(x\right)-sen\left(x\right)}dx$
$\frac{a^2-b^2}{3a+3b}$
$5-2x\le12-\left(x+3\right)$
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