$\left(3m+2n\right)\left(9m^2-6mn\right)$
$\int4x^{15}dx$
$\int_{4-x^2}^{x+2}dx$
$3^4\cdot\:21\cdot\:49^{-1}14^{-3}$
$\frac{\sin\left(x\right)}{1-\cos^2\left(x\right)}$
$2m^23m-2$
$-4\cdot\left(5+-1\right)$
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