June 8, 2018
1:45 a.m.
Steven D'Aprano wrote:
Even old-school scientific calcuators without the fancy CAS symbolic maths are capable of having cos(90) return zero in degree mode.
FWIW, my Casio fx-100 (over 30 years old) produces exactly 1 for both sin(90°) and sin(pi/2) for its version of pi. -- Greg