$\frac{9\sec\left(x\right)}{\csc\left(x\right)}$
$20c^2+35c^3$
$\left|3\right|-2$
$\frac{20x^3+40x^7-60x}{10x^9}$
$8x+4-2x-3$
$\left(y^2+4\right)\left(y^2+7\right)$
$\frac{3x^3-x^2+3x-1}{x+1}$
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