$8\cdot9+2\cdot5+-7$
$area\:2$
$5x^2+9x-2$
$\int\left(2x^2+3x\right)^3\:dx$
$\frac{-\sin\left(x\right)}{1-\left(\cos\left(x\right)\right)^2}$
$\frac{8}{x}>3$
$\left(7b-2x\right)^2$
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