GNU/Linux |
RedHat 9.0(Shrike) |
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acosh(3) |
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acosh − inverse hyperbolic cosine function
#include <math.h>
double acosh(double x);
The acosh() function calculates the inverse hyperbolic cosine of x; that is the value whose hyperbolic cosine is x. If x is less than 1.0, acosh() returns not-a-number (NaN) and errno is set.
EDOM |
x is out of range. |
SVID 3, POSIX, BSD 4.3, ISO 9899
asinh(3), atanh(3), cosh(3), sinh(3), tanh(3)
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acosh(3) | ![]() |