RPNcalc+ free colorful web calculator

[EdS2]

(11-22-2020 04:15 PM)radulle Wrote:  For trigonometric functions that return very small values (e.g. sin(0) and cos(pi/2) give less than 10E-16) would it be correct to return zero?

Ideally not, because of the wonderful behaviour of sin(x) near pi:
sin(3.1415) -> 0.00009265358966
sin(3.1415926535) -> 8.97932384626434e-11

About the keyboard shortcuts: I was surprised to see S for sin and s for arcsin. Why this way around? My intuition led me to expect the unshifted key to perform the forward function.