COS(X) dislpay wrong answer

[Magnus512]

(09-02-2018 01:02 PM)JMB Wrote:  An easy way to convert among rectangular, cylindrical and spherical coordinates, is to use the built-in functions polar_coordinates and rectangular_coordinates. You can see my conversion functions in the post: http://www.hpmuseum.org/forum/thread-7005.html.

Of course my functions also suffer from round-off errors. Nonetheless, the functions polar_coordinates and rectangular_coordinates deliver exact results in CAS, when using the radian mode:

That's good but, I'm doing this by myself, so now I get the same error y multiple occasions, even in cas mode, and a new error comes out, I can't store the results in a matrix but I can store it in a list so...