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Vektor $\\langle \\var{b*a}, \\var{a}, \\var{-b*a} \\rangle$ tegak lurus bidang singgung hiperbola $\\var{b^2}x^2+y^2-\\var{b^2}z^2=\\var{b^2}$ di titik $A(x_0,y_0,z_0)$.

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Jika titik $A$ berada di atas bidang-$xy$, maka $\\var{b}(x_0+y_0+z_0)=\\ldots$.

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