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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

Grade:12

1 Answers

Arun
25750 Points
5 years ago
Dear student
 
I am not getting the answer as required even after toonmany attempts. Please check the question.
 
You can also attach an image. I will be happy to help you.
 
Regards
Arun

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