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acosh − inverse hyperbolic cosine function |
#include <math.h> double acosh(double x); |
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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. |
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EDOM |
x is out of range. |
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SVID 3, POSIX, BSD 4.3, ISO 9899 |
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asinh(3), atanh(3), cosh(3), sinh(3), tanh(3) |