$6x^2+30x+36$
$\frac{d^2}{dx^2}\sqrt{3x^2+1}$
$cos\left(4x\right)-cos\left(8x\right)$
$\lim_{x\to\infty}\frac{x^2-16x}{\left(x+1\right)^2}$
$5a^2b^2+125\:b^6\:x^8\:-50\:ab^4\:x^4\:$
$\frac{\left(x^3\right)^4}{\left(x^3\right)^2}$
$-6-5x^2+7x^2-7y^3+y^3+2x^2$
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