given the following code:

double sin = Math.Sin(59.0);
double sin2 = Math.Sin(31.0);

first result is 0.64.. second result is -0.4..

if I type the same numbers into my calculator:
sin(59) = 0.86..
sin(31) = 0.51..

what do I do wrong?

CodePudding user response：

The same as most programming languages, in S, Sin function gets input in Radian. So if you desire to get the sin of 59 degree, you should write Math.Sin(59.0 * 3.1415/180.0) (By 3.1415, I mean PI value).