$\int\:5x\sqrt{x-12}\:dx$
$13\cot^2\left(x\right)-\frac{1}{\sin^2\left(x\right)}=1$
$3x+12=5x-36$
$4\left(b+9c\right)+3\left(12a+9b\right)-a+4\left(b+c\right)$
$4\left(x-5\right)^2-2\left(x+4\right)^3$
$11a-7\left(a+5\right)$
$49x^2x+42x+9$
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