b>C4_ATANH</b> evaluates the inverse hyperbolic tangent of a C4 argument.
        </li>
        <li>
          <b>C4_COSH</b> evaluates the hyperbolic cosine of a C4 argument.
        </li>
        <li>
          <b>C4_LOG</b> evaluates the logarithm of a C4.
        </li>
        <li>
          <b>C4_MAGNITUDE</b> returns the magnitude of a C4.
        </li>
        <li>
          <b>C4_SINH</b> evaluates the hyperbolic sine of a C4 argument.
        </li>
        <li>
          <b>C4_SQRT</b> returns the 