$\frac{\left(x-3\right)\left(x+3\right)\left(x+3\right)}{x+4}$
$\left(-1\right)^n\left(\frac{2^n}{3^n+n}\right)x^n$
$\frac{c^9\:d^{-7}}{c^{14}\:d^{-10}}\:$
$3^{\left(x^2+1\right)}-9^x=0$
$9x^2\cdot b^2-25$
$\left(4x^3-3x^2\right)^2$
$\int y^{-1}.e^{2y}dy$
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