$4a^4-12a^2+9$
$11\cos\left(x\right)=2tan\left(x\right)$
$-\left(2+6\cdot\left(-3\right)\right)$
$\lim_{x\to1}\frac{\sqrt{x^2-5x-1}-\sqrt{x^3-5x-1}}{x-1}$
$8a^5+\:125a^2$
$2\left(x-3\right)^2-7$
$4x^2-4x+\frac{4^2}{4}$
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