Library /sys$common/syshlp/HELPLIB.HLB
CRTL, copysign, Description
 *Conan The Librarian 

    The copysign functions return x with the same sign as y. IEEE 754
    requires copysign(x,NaN), copysignf(x,NaN), and copysignl(x,NaN)
    to return +x or -x.
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