$\frac{20x^2+17x-24}{x^3-x}$
$\frac{2}{5}x+5-\frac{1}{5}x-3$
$\frac{3x^4+4x^2}{x^2}$
$\lim_{x\to0}\left(\frac{sin6x}{tan2x}\right)$
$\frac{3x^2y+15xy}{x^2-25}$
$\sin\left(180-a\right)$
$\tan\left(y\right)\left(\cot\left(y\right)+\tan\left(y\right)\right)$
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