$\frac{27^3}{9^2}$
$7r=-63$
$\frac{dy}{dx}+\frac{2y}{x}\:=x^2+1$
$5x^3y^2+45x^2+30x^2y$
$( - x ^ { 3 } + 125 ) : ( x - 5 )$
$\int e^{cos\left(\pi x\right)}sin\left(\pi x\right)dx$
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