$\lim_{x\to0}\left(\frac{\sqrt{4+xsenx}-2}{x}\right)$
$c^2-13c-13$
$5x^2-14x+1$
$x-y+z=3$
$\left(x-8\right)^2\left(y-12\right)^2$
$\lim_{x\to0}\left(\frac{x^5-1}{x^3-1}\right)$
$\lim_{h\to0}\left(\frac{\frac{1}{m+h}-\frac{1}{m}}{h}\right)$
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