$\frac{d^2}{dx^2}\left(x^{\left(2\right)}+y^{\left(2\right)}-5x-4y+xy\right)$
$-w^2+5w+4=0$
$5x^2+20x-17$
$9r^22-6r+1$
$\frac{dy}{dx}=\frac{ysinx}{1+y^2},\:y\left(0\right)=2$
$-\frac{20}{\left(-4\right)-6}$
$3x^2+8x+\frac{6}{7}\cdot\frac{6}{7}x^2-x+6$
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