$\cot\left(a\right)+\tan\left(b\right)$
$\frac{1}{cot^2x}-sec^2x$
$12x+11a-18x$
$\left(\frac{4}{3}a+\frac{2}{3}b\right)\left(\frac{4}{3}b+\frac{2}{3}b\right)$
$\left(3y^22y^3\right)^2$
$\left(a+2\right)+\left(a+1\right)\left(a+2\right)$
$\int\:\:\frac{x-1}{\sqrt{x^2-2x}}dx$
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