Euler Identity in Home

[jebem]

(04-05-2014 06:11 PM)DrD Wrote:  One can look to http://www.wolframalpha.com/ for another take on this:
sin(pi)=1.2246467991473532x10-16
(double).sin(pi)=0

And again, on HP Prime in Home mode:
1) So, it is expected to not get an answer of Zero for SIN(Pi), as previously explained by others (I got a result = -2.06761537357E-13);

2) However, it will give "exact" rounded values for different situations (using Scientific 4 digit format):
2.1) SIN(Pi/2) --> Result = 1.0000
2.2) COS(Pi) ---> Result = -1.0000
To be honest, I was not expecting the results to be so rounded here, for the same reasons used to explain the SIN(Pi).

I just checked my HP-50G, and the results are exactly the same ones I get on my HP-Prime, so I'm happy to find out that the behavior is consistent between the two calculators. There is no reason to not trust the Prime here, unless we don't trust the 50G either.