CauchyInequality
Difficult
Let $a, b, c$ be the lengths of the sides of triangle $ABC$. Show that
$$\sqrt{a}(c+a-b) + \sqrt{b}(a+b-c)+\sqrt{c}(b+c-a)\le\sqrt{(a^2 + b^2 + c^2)(a+b+c)}$$
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