Grade 12Trigonometry
In ∆ABC, prove that a(b²+c²)cosA b(c²+a²)cosB+c(a²+b²)cosC=3abc
In ∆ABC, prove that a(b²+c²)cosA b(c²+a²)cosB+c(a²+b²)cosC=3abc
1 Answer
Arun
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Arun
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