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In a Delta ABC, AD is a median and AL bo...

In `a Delta ABC, AD` is a median and `AL bot BC`.
Prove that
(a) `AC^(2)=AD^(2)+BC*DL+((BC)/(2))^(2)`
(b) `AB^(2)=AD^(2)-BC*DL+((BC)/(2))^(2)`
(c) `AC^(2)+AB^(2)=2AD^(2)=2AD^(2)+(1)/(2)BC^(2)`

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