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Two system of rectangular cartesian coor...

Two system of rectangular cartesian coordinate axes have the same origin. If a plane cuts them at distance a, b, c and p, q, r from the origin, the show that `(1)/(a^(2))+(1)/(b^(2))+(1)/(c^(2))=(1)/(p^(2))+(1)/(q^(2))+(1)/(r^(2))`.

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