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Grade: 11

                        

if a+b+c=180,then prove that- sin(b+2c)+sin(c+2a)+sin(a+2b)=4sin[(b-c)/2]sin[(c-a)/2]sin[(a-b)/2]

5 years ago

Answers : (2)

Gman Namg
420 Points
							
just take a=b=c=60deg
or use the formul of sinc+sind
5 years ago
Gman Namg
420 Points
							
just take a=b=c=60deg
or use the formul of sinc+sind
5 years ago
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