HP Forums

Full Version: where is 35s cos bug
You're currently viewing a stripped down version of our content. View the full version with proper formatting.

It was mentioned that 35s cannot proprely calculate cos (and some other trig functions) in certain ranges.

Where can I find examples with an appropriate argument and erroneous result given by 35s? I cannot seem to find the bad inputs.

Do a Google site search like so:

cos bug hp 35s

Google finds numerous pages with a sentence "Cos(x) for x near 90 is dud". It also, surprisingly, finds this very thread.

However, what I am trying to find is actual numeric example of X where cos X is calculated incorrectly by 35s.

If found mentions of "cos(89.999) bug", but my 35s says
cos(89.999)=1.74532924306e-4 which agrees to 9 digits with what PC tells me. Is that a bug? That it is only 9 digits? Must be all 12?

Edited: 5 Oct 2008, 10:39 p.m.

Andrew --

Here is what you seek:


The new HP-20b gives all correct results, so I believe that the bug has been addressed, and will not recur.

-- KS