$\lim_{x\to1}\frac{\sqrt{x^2+6x-1}-\sqrt{x^3+6x-1}}{x-1}$
$171-1-2$
$\lim_{x\to3}\left(\frac{5x^2-16x+3}{x^2-6x+9}\right)$
$\int\left(1+3t\right)t^2\:dt$
$a^2\left(a^2-4a+4\right)-4a\left(a^2-4a+4\right)+4\left(a^2-4a+4\right)$
$2xy^'+4y=10x^3$
$\left(4-5x\right)\:^3$
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