$\frac{1+\cos}{\cos}=\sec+1$
$\frac{19^{7}\cdot19^{-5}}{19^{4}}$
$\int\:\:x^3\sqrt{9x^2}dx$
$\left(2000\right)^2$
$\lim_{x\to3}\left(\left(x-3\right)^2\ln\left(x-3\right)\right)$
$\frac{6}{8}\cdot\frac{4}{3}$
$\frac{x^4+2x^2-5}{x}$
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