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     The cosh, sinh, and tanh hyperbolic trigonometric functions return
     the hyperbolic cosine, hyperbolic sine, and hyperbolic tangent,
     respectively, of <x>.
 
     The long double functions use an 80-bit long double form of
     arguments and return values. In all other respects, they are
     identical to the regular functions.
 
     Return Value
 
     If the result is too large in a cosh call, the function returns
     HUGE_VAL and sets errno to ERANGE.
 
     If the result is too large in a sinh call, the function returns
     ±HUGE_VAL and sets errno to ERANGE.
 
     There is no error return for tanh.
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