ACH

Contents

 


ach returns its parameter's hyperbolic arc-cosine.

 

Syntax

   ach(num_exp)

 

Parameters

Element

Description

Restrictions

num_exp

Numeric Expression

1<= exp_num<= 10^40

 

Examples

   Y = ach(3*X)

 

Description and Comments

ach(X) returns ln(X+sqr(X*X-1)).

ach is the inverse of the ch function.

The result is the Double type.

 

Associated Errors

Error

Description

ERMODE (10)

The parameter is not numeric.

ERTRIH (15)

The parameter is less than one (1).

ERHUGE (13)

The parameter is too large.

 

Associated Keywords

ASH  -  ATH  - CH  -  SH  -  TH


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