Incorrect values with some trigonometric functions

[Aries]

(08-04-2018 07:28 AM)Stevetuc Wrote:  

(08-04-2018 06:52 AM)Aries Wrote:  I think you need to go to CAS mode to get the correct result and set the angle measure to radians in the Home Settings
Best,

Aries

The small error will still exist in home mode though. It exists in the Casio too but the casio rounds such residual errors in trig functions to 0 to present a clean result. The Prime is more honest. Maybe for educational use, there could be a user flag that toggles this behaviour so that say a trig result below a threshold < 1e-11 say, is displayed as 0.

Y' know, Home = numerical and CAS = symbolic, on any numerical calculator getting a non-zero result (for cos(pi/2)) is an acceptable solution, as PI cannot be represented numerically.
This is where CAS comes into play, as a symbolic solver.
As you said, the Prime is more honest in this respect.
Best,

Aries