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"27. \\( \\Delta A B C \\) is right-angled at \\( B \\) and \\( D \\) is the midpoint of \\( B C \\). Prove that \\( A C ^ { 2 } = 4 A D ^ { 2 } 3 A B ^ { 2 } \\)\n( \\( D \\).\n\\[ \\frac { 6 } { \\theta } \\text { ? } \\]"

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