$\int\frac{4}{x^2-9}dx$
$\tan^2\left(x^3-8\right)$
$598-31$
$\int_0^1\left(e^{-sx}x^2\right)dx$
$\lim_{x\to\infty}\left(\frac{\log\left(n\right)}{\sqrt{n}}\right)$
$\tan^2x+3=4\sec^2x$
$42 = - 7 ( z - 3 )$
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