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\sqrtSynopsis, one of:
\sqrt{arg}
\sqrt[root-number]{arg}
The square root, or optionally other roots, of arg. The optional
argument root-number gives the root, i.e., enter the cube root of
x+y as \sqrt[3]{x+y}.
The radical grows with the size of arg (as the height of the
radical grows, the angle on the leftmost part gets steeper, until for
a large enough arg, it is vertical).
LaTeX has a separate \surd character (see Math symbols).