$3x^4+8x^3-2x^2-10x+4$
$\frac{dx}{dt}=x\left(2-x\right)^2$
$9\cos\left(2x\right)$
$2a^2+16$
$-15-\left(-2\right)-\left(-3\right)+1$
$x^2-20x+5$
$x^2+2x^2-8x$
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