These are the familiar
The arguments to all of these functions are in units of radians; recall
that pi radians equals 180 degrees.
The math library doesn't define a symbolic constant for pi, but you can define your own if you need one:
#define PI 3.14159265358979323846264338327
You can also compute the value of pi with the expression
errno error conditions are defined for this function:
ERANGEand returns either positive or negative
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