$3a+7-11-9a$
$\int cos\left(2x\right)cos\left(8x\right)dx$
$4x^2+28xy+36y^2$
$\frac{-24x^6}{6x^2}\left(2\right)$
$9a^2-36$
$\frac{x^n}{5^n}$
$m^3-11m^2+m-11$
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