$\lim_{x\to1}\left(\frac{\sqrt{2+x}-\sqrt{4-x}}{x-1}\right)$
$36x^4-64$
$x-1<=3$
$5n^3-30n^2+45n$
$\left(y-c^2\right)^2$
$y'=e^{2y}$
$\left(3x^5-5m^4\right)^2$
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