$\left(4x+2\right)\left(2x-7\right)$
$\lim_{x\to0}\left(\frac{sin^2\left(x\right)}{2cos\left(x\right)-2}\right)$
$\lim_{x\to1}\frac{\sqrt{x^2+40x-1}-\sqrt{x^3+40x-1}}{x-1}$
$\frac{4x^{12}-9x^{9}-4x^{3}-5}{x^{3}-1}$
$\left(12x^5\right)\left(3x^4\right)$
$\frac{3}{4}^{0-2}$
$\frac{36x^4-109x^2+25}{3x-5}$
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