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acosh() - Return the hyperbolic Cosine of value as a Argument in C++

//acosh() function

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
double v= -12.0;
clrscr();
cout<<" acosh("<<v <<") is: "<<log(v+sqrt(pow(v,2) - 1));
getch();
}