$sec^24x\left(2\right)$
$\lim_{x\to0}\left(\frac{x^2}{\sqrt[3]{x^6+x^2}}\right)$
$\int_0^4-xdx$
$\lim_{x\to\infty}\left(\frac{x^2+20}{x^3+17}\right)$
$\tan\left(a\right)^2+\tan\left(a\right)-6$
$\frac{x^2}{x^2-9}$
$\frac{3}{\sqrt{x+1}}$
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