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Show that the difference of the focal distances of any point on the hyperbola `9x^2-4y^2 = 36` is equal to its transverse axis.

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UNITED BOOK HOUSE-MODEL QUESTION PAPERS-SET 4-EXERCISE
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  19. Prove that the 4 foci of the two ellipses 25x^2+169y^2=4225 and 400x^2...

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  20. Show that the difference of the focal distances of any point on the hy...

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