$\frac{d}{dx}\frac{x^2+2x+3}{2x^2-1}$
$\int\left(\frac{\sqrt{121-x^2}}{x}\right)dx$
$\int\left(8e^x\right)dx$
$\frac { 6 x ^ { 4 } + 5 x ^ { 3 } + 3 x - 5 } { 3 x ^ { 2 } - 2 x }$
$\left(4^{-9}\right)^6$
$1x^2+2x\:-\:43$
$15\left(x-2\right)$
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