Question
Mon September 17, 2012 By:
 

in ?ABC if ?C=60° then prove 1/(a+c)+1/(b+c)=3/(a+b+c)

Expert Reply
Tue September 18, 2012

In triangle ABC, angle C is 60 degree.

So, A + B = 120 degree

Or, B = 120 degree - A

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