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Q 1865291165.     Prove that if a plane has the intercepts `a, b,c` and
is at a distance of `p` units from the origin, then
`1/a^2 + 1/b^2 + 1/c^2 = 1/p^2` .
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)