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Synopsis:
    #include <math.h>
    double cosh( double x );

Description:
    The cosh function computes the hyperbolic cosine of x.  A range error
    occurs if the magnitude of x is too large.

Returns:
    The cosh function returns the hyperbolic cosine value.  When the
    argument is outside the permissible range, the  matherr function is
    called.  Unless the default  matherr function is replaced, it will set
    the global variable  errno to  ERANGE, and print a "RANGE error"
    diagnostic message using the  stderr stream.

Example:
    #include <stdio.h>
    #include <math.h>

    void main()
      {
        printf( "%f\n", cosh(.5) );
      }

    produces the following:

    1.127626

Classification:
    ANSI

Systems:
    Math

See Also:
    sinh, tanh, matherr