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CRTL, tanh, Return Values
 *Conan The Librarian 

    n                  The hyperbolic tangent of the argument.
    HUGE_VAL           The argument is too large; errno is set to
                       ERANGE.
    NaN                x is NaN; errno is set to EDOM.
    0                  Underflow occurred; errno is set to ERANGE.
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