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

[Joe Horn]

(09-24-2018 02:05 PM)tcab Wrote:  I’ve just been playing around with truism that sin(x)^2+cos(x)^2 = 1.

I ran a loop checking this for different values of x on different calcs, incl Python. Let’s say x ranges from 0..20.

The only calc that had no errors was Free42, which gave 1 in all cases.

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.