In any \( \triangle \mathrm{ABC} \), prove that
\( \mathrm{P} \)
\[
r^{2}+r_{1}^{2}+r_{2}^{2}+r_...
In any \( \triangle \mathrm{ABC} \), prove that
\( \mathrm{P} \)
\[
r^{2}+r_{1}^{2}+r_{2}^{2}+r_{3}^{2}=16 R^{2}-a^{2}-b^{2}-c^{2} \text {. }
\]
W
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