Acosh

Syntax

double acosh  (double x);
float acoshf (float x);
long double acoshl (long double x);

Description

Returns the nonnegative arc hyperbolic cosine of x, expressed in radians.

The arc hyperbolic cosine is the inverse operation of the hyperbolic cosine.

Parameters

x

Value whose arc hyperbolic cosine is computed.

If the argument is less than 1, a domain error occurs.

Return Value

Nonnegative arc hyperbolic cosine of x, in the interval [0,+INFINITY] radians.

Note that the negative of this value is also a valid arc hyperbolic cosine of x One radian is equivalent to 180/PI degrees.

If a domain error occurs:

• And math_errhandling has MATH_ERRNO set: the global variable errno is set to EDOM.
• And math_errhandling has MATH_ERREXCEPT set: FE_INVALID is raised.

Example

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