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Grade: 11 

                        
prove that 4{bc cosA/2+ cosB/2 +ab cos C/2} = (a+b+c)^2
2 years ago

Answers : (1)

Saurabh Koranglekar
askIITians Faculty
8407 Points 
							Dear student

Assume equation to be true

To check the given question assume an equilateraltriangle of sides equal to 1 unit and see if LHS matches RHS

you will see it does not

contradictions never coexist, check the assumptions

hence kindly repost acorrect question
2 years ago
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