$\left(-3x-14\right)\left(-3x+14\right)$
$20z+3-15z$
$\frac{d}{dx}x^2\sqrt{25-x^2}$
$\left(m^4n^6-3\right)^2\left(m^4n^6+12\right)$
$\lim_{x\to0}x^6e^{-x^5}$
$\cos\left(x^2+5x\right)$
$\frac{2x^2+4x-2}{6x-1}$
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