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If `A B C` is a right triangle right-angled at `Ba n dM ,N` are the mid-points of `A Ba n dB C` respectively, then `4(A N^2+C M^2)=` (A) `4A C^2` (B) `5A C^2` (C) `5/4A C^2` (D) `6A C^2`

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