$+1+4-2-6+9-2\:.\left(-4\right)$
$\left(5x+4\right)\cdot\left(2x+7\right)$
$\csc\left(a\right)+2=0$
$\frac{x-3}{x^4-1}$
$\int\frac{12x-20x^4}{\sqrt{3x^2-2x^5}}dx$
$-\frac{24}{2}$
$m^2+3m-13$
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