\sqrt (LaTeX2e unofficial reference manual (November 2018))

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#### 16.7.4 `\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).

Unofficial LaTeX2e reference manual