$a^2+16a-64$
$\frac{81x^4-1y^8}{16x^4+256y^8}$
$\lim_{x\to\infty}\left(tan\left(\frac{4}{x}\right)\right)$
$y=4\csc\left(4\pi x+\frac{1}{3}\pi\right)$
$\left(\sec^2\left(x\right)+1\right)\left(\sec^4\left(x\right)\right)+\cot^2\left(x\right)$
$\left(x+10^4\right)$
$-343-\left(-23\right)$
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