$\lim_{x\to3}\left(x^2+x+1\right)$
$4d^2+14d+12$
$\int_0^6\left(\frac{\sqrt{25+\left(1+x^2\right)^2}}{1+x^2}\right)dx$
$\left(-2\right)\cdot\left(-2\right)\cdot2\cdot\left(-3\right)$
$8x^2-15x-3\ge0$
$\frac{dy}{dx}=\frac{y^2-9}{x^2+4}$
$\cos\left(\frac{\pi}{-2}\right)$
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