$\cot\left(x\right)-\frac{\csc^2\left(x\right)}{\cot\left(x\right)}$
$\left(4x+3y-z^6\right)\left(4x-3y+z\right)$
$\left(3x^2-x-1\right)\left(2x+1\right)$
$2\log x=\log36$
$-2x\left(x-2\right)$
$\frac{5-2}{n}+\frac{m-5}{-1}+5.2$
$\lim_{x\to9}\frac{x^2-13x+36}{x-9}$
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