Nasty Triangles 5

Geometry Level 4

Given \(\triangle ABC\), \(AD\) and \(BE\) are angle bisectors of \(\angle BAC\) and \(\angle ABC\) respectively, if \(AB=21\), \(BC=24\), \(AC=15\), find the length of \(DE^2\).


This is one part of 1+1 is not = to 3.

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