$7+\left(13-2\right)-15$
$\left|-\left(-3\right)\right|\cdot1$
$\left(x-2y\right)\left(9m+9n\right)$
$\left(2x\left(\sin\left(x\right)\right)\right)\left(2x\left(-\sin\left(x\right)\right)\right)+\left(x^2\left(\cos\left(x\right)\right)\right)\left(2\cos\left(x\right)\right)$
$13a^2-7a-6$
$\frac{x^2-x-2}{x-2}$
$\int\frac{x+1}{\left(x+5\right)\left(x-1\right)}dx$
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