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In the adjacent figure, \(ABC\) is a right-angled triangle with right angle at \(B\) and points \(D\), \(E\) trisect \(BC\). Prove that \(8AE^2\) \(=\) \(3AC^2 + 5AD^2\).
 
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This is a creative task. Your teacher will check and evaluate the points for the same.