In a quadrilateral \( A B C D \), show that \[ (A B+B C+C D+D A)2(B D+A C) \text {. } \] \( \dot...

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In a quadrilateral \( A B C D \), show that
\[
(A B+B C+C D+D A)2(B D+A C) \text {. }
\]
\( \dot{0} \)
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