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If xcostheta+ycosphi+zcosshi=0;xsintheta+ysinphi+zsinshi=0;xsectheta+ysecph

If xcostheta+ycosphi+zcosshi=0;xsintheta+ysinphi+zsinshi=0;xsectheta+ysecphi+zsecshi=0;then prove that (x^2+y^2-z^2)^2=4x^2y^2

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