WP-32S in 2016?
01-12-2016, 12:27 AM
Post: #70
 Dieter Senior Member Posts: 2,397 Joined: Dec 2013
RE: WP-32S in 2016?
(01-12-2016 12:08 AM)matthiaspaul Wrote:  Regarding 1-cos(x), I recommend to implement not just the versine but the whole set of missing trigonometric functions

I'd say the first four (and ther inverses) are sufficient. ;-)
That's the versine, vercosine, coversine and covercosine.
This way 1±sin(x) and 1±cos(x) can be calculated exactly.

(01-12-2016 12:08 AM)matthiaspaul Wrote:  By the way, the above mentioned floating-point standards also recommend new variants of trigonometric functions related to factors of pi (@ recommended by IEEE, the others are supported by Oracle).

So do I ("..a sin(x*pi) function that returns exact results for integer fractions of Pi"). ;-) But a complete function set would include both trig(pi*x) and trig(pi/x) functions. Think of arguments like pi/3 or 2/3*pi which cannot be expressed exactly, neither in base-2 nor base-10 representation – 0,3333333333*pi is not pi/3.

Dieter
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