$12abc+6bc$
$\left(9f+9\right)-\left(4f+7\right)$
$\frac{cos\left(5x\right)-cos\left(13x\right)}{2}$
$2x^2-8x-2=0$
$24a-36b$
$x\frac{dy}{dx}+\frac{2x+1}{x+1}y=x-1.$
$\int\sqrt{u^2+a^2}du$
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