$4-100x^2$
$\lim_{x\to0}\left(\frac{\cos\left(ax\right)-\cos\left(bx\right)}{x^2}\right)$
$\frac{25x^{-2}y^3z^{-4}}{5^3x^2y^3\:z^{-7}}$
$27\sqrt{2}-17\sqrt{2}$
$\lim_{x\to2}\left(\frac{x^2-x-6}{x-2}\right)$
$\frac{6x^43x^3-2x}{3x^2+2}$
$-\:3am\:-\:5am\:-\:6am\:-\:9am$
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