May 2, 1991 COSH 3

### NAME

cosh, coshf - hyperbolic cosine function

### LIBRARY

Math Library (libm, -lm)

### SYNOPSIS

```double` cosh(```double x`)
```float` coshf(```float x`)

### DESCRIPTION

The cosh(``) and coshf(``) functions compute the hyperbolic cosine of ```x`.

### RETURN VALUES

If the magnitude of x is too large, cosh(```x`) and coshf(```x`) return Inf and sets the global variable errno to ERANGE.

### SEE ALSO

acos(3), asin(3), atan(3), atan2(3), cos(3), math(3), sin(3), sinh(3), tan(3), tanh(3)

### STANDARDS

The cosh(``) function conforms to ANSI X3.159-1989 (``ANSI C89'') .