23. Prove that (a + b + c)2 - a - b - C = 3(a + b)(b + c) (c+a). 24. If a, b, c are all nonzero and a+b+c= 0, prove that
a² 6² c²
= 3.
bc
ab
+
+
са
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23. Prove that (a + b + c)2 - a - b - C = 3(a + b)(b + c) (c+a). 24. If a, b, c are all nonzero and a+b+c= 0, prove that
a² 6² c²
= 3.
bc
ab
+
+
са
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