C Tutorial/math.h/atanh
atanh
Item Value Header file math.h Declaration float atanhf(float arg);double atanh(double arg);long double atanhl(long double arg); Return returns the arc hyperbolic tangent of arg. Parameter This argument must be in the range -1 to 1.
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("%f.\n", atanh(12));
return 0;
}