$\lim_{x\to3}\left(\frac{3x+7}{x+1}\right)$
$x-14=15$
$\frac{6x^3-6x^2+3x}{3x}$
$\left(2x+1\right)-5x^2$
$\frac{\left(4^{-3}\right)\left(4^2\right)}{\left(4^{-2}\right)\left(4^{-2}\right)}$
$\left(x+4\right)^3=0$
$\sec\left(x\right)\left(1-\cos\left(2x\right)\right)=\frac{2}{\cot^2\left(x\right)}$
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