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plot (n^2-1) x^4 - 2 d (n^2 - 1) x^3 + ((d^2+w^2)(n^2 - 1) + w^2 - h^2) x^2+2 d h^2 x - d^2h^2 where n=1.33,w=1, h=5,d=30
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