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`\sqrt`

Synopsis, 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).