HP35s Cos[x] and Tan[x] bugs resolved?  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: HP35s Cos[x] and Tan[x] bugs resolved? (/thread254436.html) 
HP35s Cos[x] and Tan[x] bugs resolved?  Thomas Windisch  10312013 I just got the HP35s and checked for the Cos(x) and Tan(x) bugs, Re: HP35s Cos[x] and Tan[x] bugs resolved?  Dieter  10312013 First of all, cos 90° should return zero, and so does the 35s. On the other hand, cos 89° gives 0,0174524064373, the value you posted. And cos 89,99999° returns 1,7453292 E7 both on your machine as well as on my early 35s bought in 2007.
So I do not think that anything has changed  the results of my early and your current 35s agree. The "bug" you mentioned refers to the loss of accuracy with arguments close to 90 degrees. In this case, the second result carries merely eight significant digits (out of twelve) with the last one truncated, not rounded: cos 89,9999 1,74532925 E6Dieter Re: HP35s Cos[x] and Tan[x] bugs resolved?  Dieter  10312013 I just found some notes re. the 35s tangent bug. According to an earlier examination, the loss of accuracy occurs at results in the order of 10^{3} to 10^{9}. These values have only 11 ... 6 valid digits, the last of which usually is truncated or 1 unit low.
Example: tan 0,2° = 3,490 6726 8160 E3 (rounded up from ..81596)Dieter
Edited: 31 Oct 2013, 1:26 p.m.
