$\frac{x^2}{x^2+6}$
$49x-28^2+4y$
$3b\cdot b$
$-9\left(1+8k\right)-7k$
$\lim_{x\to0}\left(\frac{tan^{-1}x}{x^2-x}\right)$
$0,7^{-\infty}$
$\frac{dy}{dx}=\sqrt{x}y^3$
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