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xcosθ+ycosϕ=−zcosψ xsinθ+ysinϕ=−zsinψ xsecθ+ysecϕ=−zsecψ and

xcosθ+ycosϕ=−zcosψ xsinθ+ysinϕ=−zsinψ xsecθ+ysecϕ=−zsecψ and we have to prove that (x^2+y^2−z^2)2=4x^2y^2

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