$2x^2+11x-21$
$2\cdot\sqrt{3}-\sqrt{3}$
$\left(4x+5y\right)^2$
$\lim_{x\to0}\left(\frac{1-\cos\left(x\right)}{x\left(\sqrt{x+1}-1\right)}\right)$
$\left(z+1\right)^3$
$x^2-6x-7=0$
$-3\left(-5\right)^2-3\left(-5\right)$
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