$\left(2x-3\right)^2+x^2+6=\left(3x+1\right)\left(3x-1\right)$
$\frac{dy}{dx}=3$
$+14+14\left(-14\right)$
$\lim_{x\to0}x^4\left(cos\left(\frac{1}{x}\right)+1\right)$
$\lim_{x\to5}\left(x^2-25\right)$
$\left(20\right)\left(-3\right)\left(-1\right)$
$\left(k-1\right)\left(k^2+k+1\right)$
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