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fixed docs for atan

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This commit is contained in:
Matthias Felleisen 2013-10-18 15:20:37 -04:00
parent 63c27e218d
commit 5de5eaaa14
1 changed files with 9 additions and 3 deletions
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12
pkgs/htdp-pkgs/htdp-lib/lang/private/beginner-funs.rkt
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@ -227,9 +227,15 @@
Computes the arccosine (inverse of cos) of a number.
@interaction[#:eval (bsl) (acos 0)]
}
@defproc[(atan [x number] [y number]) number]{
Computes the arctan of the given number or the ratio of the two given numbers.
@interaction[#:eval (bsl) (atan 0) (atan 3 4)]
@defproc[(atan [x number]) number]{
Computes the arctangent of the given number:
@interaction[#:eval (bsl) (atan 0) (atan 0.5)]
Also comes in a two-argument version where @racket[(atan x y)] computes
@racket[(atan (/ x y))] but the signs of @racket[x] and @racket[y]
determine the quadrant of the result and the result tends to be more
accurate than that of the 1-argument version in borderline cases:
@interaction[#:eval (bsl) (atan 3 4) (atan -2 -1)]
}
@defproc[(sinh [x number]) number]{
Computes the hyperbolic sine of a number.