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mention that expt does like sqrt when it gets 1/2 as a second argument

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Robby Findler 2021-03-17 19:34:06 -05:00
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pkgs/racket-doc/scribblings/reference/numbers.scrbl
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@ -602,6 +602,10 @@ If @racket[z] is exact @racket[0], the result is as follows:
@item{otherwise --- result is @racket[0]}
]
If @racket[w] is exact @racket[1/2], the result is the same as @racket[(sqrt z)],
which can be exact. Other fractional powers are not treated specially in this manner:
@mz-examples[(expt 9 1/2) (expt 9 0.5) (expt 16 1/4) (expt 16 0.25)]
Further special cases when @racket[w] is a @tech{real number}:
@margin-note*{These special cases correspond to @tt{pow} in C99 @cite["C99"],
except when @racket[z] is negative and @racket[w] is a not an