$\frac{\cot+\cot}{\tan+\tan}=\cot2$
$9a^2b^3+7a^2b^3-15b^3a^2$
$81x^2y^4-16x^6y^2$
$tana-seca$
$\frac{p}{9}-1-2$
$\int\frac{d}{3\sqrt{x}}$
$-m-3m-6m-5m$
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