$3\left(3\right)^2+12x+9$
$\frac{-5x^2+7x+6}{-x+2}$
$36^2x-72x+81$
$\left(a-3\right)\left(a+1\right)$
$\left(\left(-2\right)\cdot\left(-5\right)\right)\cdot17$
$\left(6x^2y\right)^3$
$\frac{\cot\left(x\right)-\cos\left(x\right)}{\cos\left(x\right)}=\frac{1-\sin\left(x\right)}{\sin\left(x\right)}$
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