$\left(2\cdot3^3\right)^2$
$20+90+51n+7$
$\int\frac{\cos^2\left(x\right)}{\sin^6\left(x\right)}dx$
$\lim_{n\to\infty}\left(\frac{\sqrt{n}+a^2}{n+1}\right)$
$\sin^2x\left(1-\csc^2x\right)$
$\frac{1}{x+3}+\frac{1}{x+6}$
$2x^2-5x-12$
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