$\frac{99}{-9}$
$27x^4+81x^3-243$
$\frac{4x^5-3x^2+x-+1}{2x^3}$
$\left(3ab-8ac^2\right)\left(3ab+8ac^2\right)$
$\left(3-x\right)\left(x-1\right)$
$\lim_{x\to0}\left(\frac{sin\left(x\right)}{x}\right)^{\left(\frac{1}{x^'}\right)}$
$2\cos\:\left(x\right)-3\cot\:\left(x\right)\csc\:\left(x\right)$
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