7.12.5.1 The acosh functions

Synopsis

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#include <math.h>
double acosh(double x);
float acoshf(float x);
long double acoshl(long double x);

Description

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The acosh functions compute the (nonnegative) arc hyperbolic cosine of x. A domain error occurs for arguments less than 1.

Returns

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The acosh functions return arcosh x in the interval [0, +(inf)].