$\int cot^8\left(\frac{x}{3}\right)csc^2\left(\frac{x}{3}\right)dx$
$\frac{d}{dx}\left(x^7=e^{-5x^7-9y^6}\right)$
$\frac{-15}{-3}-1$
$\left(a^2b-1\right)\left(a^2+1\right)-a^2-1$
$6r-3r-r$
$2-6x-10$
$\left(x^2-y^2\right)\left(2x+4y\right)$
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