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AD is a median of the DeltaABC.If AE and...

AD is a median of the `DeltaABC`.If AE and AFare medians of the triangles ABD respectively, and AD=`m_1,AE=m_2AF=m_3,` then find the value of `a^2/8`.

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`a^2/8=m_2^2+m_3^2-2m_1^2`
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