$\lim_{x\to0}\frac{\cos\left(2x\right)-\cos\left(6x\right)}{x^2}$
$\frac{x^2-4}{x+4}$
$\frac{d}{dx}y=\sqrt{\frac{x}{x-7}}$
$\frac{x^2-3x-3}{x+2}$
$\int\frac{4x+3}{x^2-2x+1}dx$
$\left(x+2\right)\left(x-465\right)$
$a^5a^3-2a^2-2$
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