$2x^2+5x=4$
$\frac{7n^2}{-10n^9}$
$15x^2-15x-180$
$9x^2-54x+81$
$w\left(x\right)=\frac{2x^2+7x+3}{x-2}$
$cot^{-1}\left(tan\frac{\pi}{3}\right)$
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