$\lim_{x\to0}\left(\frac{\ln\left(\cos\left(3x\right)\right)}{\ln\left(\cos\left(7x\right)\right)}\right)$
$\sqrt[3]{2^9}$
$x^2-20x+1$
$54,043+48,911$
$\frac{dy}{dx}=\frac{x-2}{y-5}$
$\lim_{x\to2}\left(\frac{4^x-16}{2^x-4}\right)$
$-x+3-x-5$
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