Fix the 2-argument case of atan to conform to the documentation and
fix the documentation.
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@ -594,13 +594,13 @@ In the one-argument case, returns the arctangent of the inexact
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approximation of @racket[z], except that the result is an exact
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@racket[0] for an exact @racket[0] argument.
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In the two-argument case, the result is roughly the same as @racket[(/
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(exact->inexact y) (exact->inexact x))], but the signs of @racket[y]
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In the two-argument case, the result is roughly the same as @racket[
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(atan (/ (exact->inexact y)) (exact->inexact x))], but the signs of @racket[y]
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and @racket[x] determine the quadrant of the result. Moreover, a
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suitable angle is returned when @racket[y] divided by @racket[x]
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produces @racket[+nan.0] in the case that neither @racket[y] nor
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@racket[x] is @racket[+nan.0]. Finally, if @racket[x] is exact
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@racket[0] and @racket[y] is an exact positive number, the result is
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@racket[x] is @racket[+nan.0]. Finally, if @racket[y] is exact
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@racket[0] and @racket[x] is an exact positive number, the result is
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exact @racket[0]. If both @racket[x] and @racket[y] are exact
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@racket[0], the @exnraise[exn:fail:contract:divide-by-zero].
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@ -1843,6 +1843,7 @@
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(test 0.0 atan 0.0 0)
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(test 0 atan 0 1)
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(test 0 atan 0 (expt 2 100))
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(test 0 atan 0 5/2)
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(test 0.0 atan 0 1.0)
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(test 314.0 round (* 100 (atan 0 -1)))
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(err/rt-test (atan 0 0) exn:fail:contract:divide-by-zero?)
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@ -2243,7 +2243,8 @@ atan_prim (int argc, Scheme_Object *argv[])
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ESCAPED_BEFORE_HERE;
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}
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if ((SCHEME_INTP(n2) && (SCHEME_INT_VAL(n2) > 0))
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|| (SCHEME_BIGNUMP(n2) && (SCHEME_BIGPOS(n2))))
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|| (SCHEME_BIGNUMP(n2) && (SCHEME_BIGPOS(n2)))
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|| (SCHEME_RATIONALP(n2) && scheme_is_positive(n2)))
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return zeroi;
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}
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