$\frac{4x-2}{2x-8}$
$x^5-4x^3-8x^2+32$
$2\tan\left(a\right)\cdot\cot\left(a\right)-\sec\left(a\right)$
$\lim_{x\to-3}\:x^2-x-1$
$z=x^3\ln\left(y\right)^2$
$\left(3x-3\right)+\left(3x-1\right)+\left(4x+2\right)+\left(7x+5\right)+\left(2x+8\right)$
$\sqrt[6]{25^3}$
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