The C library function double sin(double x) returns the sine of a radian angle x.
double sin(double x)
#include #include #define PI 3.14159265 int main () { double x, ret, val; x = 45.0; val = PI / 180; ret = sin(x*val); printf("The sine of %lf is %lf degrees", x, ret); return(0); }
The sine of 45.000000 is 0.707107 degrees