Take 2 triangles, $ABC$ and $OBC$, with the same base $BC$.
If $\angle A<\angle O$, then $AB+AC>OB+OC$.
This question is derived from the textbook question - for a point $O$ in the triangle $ABC$, $AB + AC > OB + OC$.
The textbook question has been solved, and the one I asked is just a more general case. Intuitively it holds, but can anyone prove it arithmetically?
It's not true as the picture show