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     The cos, sin, and tan trigonometric functions return the cosine,
     sine, and 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 <x> is large, a partial loss of significance in the result may
     occur in a trigonometric function. In this case, the function
     generates a PLOSS error. If <x> is so large that significance is
     completely lost, the function prints a TLOSS message to stderr and
     returns 0. In both cases, errno is set to ERANGE.
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