$a^4-10a^2+9$
$\frac{d^2}{dx^2}\left(y+2xy-2=4\right)$
$\frac{dy}{dx}=30-6x-5y+xy$
$\left(-5\right)\left(-145\right)$
$x=3x+3.22$
$x^2-x+0.25$
$\left(-2+7\right)\cdot\left(-3-1\right)$
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