Type `' sqrt($) RET`.

If the `Q` key is broken, you could use `' $^0.5 RET`.
Or, RPN style,

(Actually, ``$^1:2'`, using the fraction one-half as the power, is
a closer equivalent, since ``9^0.5'` yields 3.0 whereas
``sqrt(9)'` and ``9^1:2'` yield the exact integer 3.)

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