$\left(w-7\right)\cdot\left(w+5\right)$
$\left(-9\right)\left(2\right)\left(-2\right)$
$y'=x\left(1-x\right)\left(2-x\right)$
$49y^2-4y+1$
$\left(1+x^2\right)\frac{dy}{dx}=x\left(1+y^2\right)$
$2+4\left(\frac{4}{x}-9\right)\ge30$
$x^4y-4x^2y-5y$
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