Grade 12th passAlgebra
cosA+cosB+cosC=sinA+sinB+sinC=0then prove cos(a+b) +cos(b+c) +cos(c+a)=0
cosA+cosB+cosC=sinA+sinB+sinC=0
then prove cos(a+b) +cos(b+c) +cos(c+a)=0
1 Answer
Saurabh Koranglekar
From here A, B, C can be found and the required equation can be proved
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