$9\left(-3c+4\right)$
$\frac{d}{dx}\left(x^2+y^2=d^2\right)$
$x^2y^2-4$
$4x^4+16x^2y+16y^2$
$\left(\frac{1}{3}a-\frac{1}{4}b\right)^4$
$4x^2-4x+21$
$3x^2+11x+3$
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