$3a^2b+b^2$
$1+4y+4y^2$
$\left(18+3x^2+11x\right)\left(x+9\right)$
$\left(2x^2-3\right)x\left(2x^2+3\right)$
$v-4<1$
$\frac{dy^2}{dx^2}+4x=1$
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