$\left(16x^2\:-1\right)$
$-65\text{and}-13$
$2-2n=3n+17$
$\left(3x^4+15x\right)\left(4x^7+3x^5\right)$
$\cot\frac{x}{2}=1$
$\lim_{x\to9}\frac{x+9}{\left(x-9\right)^4}$
$\frac{-6x^8}{3x^3}$
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