$\left(a^2+b^4\right)^2$
$-19m\left(17m^2\right)$
$0\cdot77$
$2\:cot^2\:x-5=0$
$\frac{d}{dx}\left(\frac{x^8+1}{x^7}\right)$
$3x^2y^2+9x^2y^2-18xy^2$
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