sin(x)^2+cos(x)^2 = 1 on different calcs

[Albert Chan]

(09-24-2018 05:16 PM)Joe Horn Wrote:  Not really; it just LOOKS like 1. Output sin(x)^2+cos(x)^2-1 instead, and you'll see where it wasn't really 1, as well as the size of the error (which is extremely small). It also depends on which angle mode you're in.

Agreed. The "1" may be just a rounded number.
However, subtract 1 to peek at the errors might not work.
Some (most?) calculator, trying to be "nice", will convert the tiny amount to zero.

http://people.ku.edu/~wzhuang/CAMseminar...ecrets.pdf

Better approach is get around the trigger, and subtract, say 0.999999999