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Let `A D` be a median of the ` A B Cdot` If `A Ea n dA F` are medians of the triangle `A B Da n dA D C` , respectively, and `A D=m_1,A E=m_2,A F=m_3,` then`(a^2)/8` is equal to (a)`m_2^2+m_3^2-2m_1^2` (b) `m_1^2+m_2^2-2m_3^2` (c)`m_1^2+m_3^2-2m_2^2` (d) none of these

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