$2d^2-4d+6$
$\cos\left(2\right)-\cos\left(4\right)=0$
$3x^2-4x-6;\:x=-2$
$\left(5y\right)^2+13\left(5y\right)+42$
$\lim_{x\to3}\left(\frac{\ln\left(x-2\right)}{x-2}\right)$
$-x^3-2x^2+5x+6$
$\lim_{x\to2}\left(\frac{\sqrt{4x-7}-\sqrt[3]{4x+1}}{x-2}\right)$
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