$\left(x^2-2\right)\left(x^2-20\right)$
$y=\cos\left(-5x^2\right)$
$y'=3x^3=-5y^2+2$
$\left(2x^2-10x\right)$
$-4x-7y+2x-8y$
$w^23w+2$
$x2+2x-99=0$
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