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Line L has intercepts a and b on the axe...

Line L has intercepts a and b on the axes of co ordinates. When the axes are rotated through a givenn angle, keeping the origin fixed, the straight line L has intercpets p and q on the transformed axes. Prove that`1/(a^(2))+1/(b^(2))=1/(p^(2))+1/(q^(2))`.

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