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acosh

Syntax

 
#include <math.h>

double acosh(double x);

Description

This function returns the inverse hyperbolic cosine of x.

Return Value

The inverse hyperbolic cosine of x. If the value of x is less than 1, the return value is NaN and errno is set to EDOM.

Portability

ANSI/ISO C No
POSIX No


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