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Grade: 11 

                        
Please refer to the attached image for the question.
6 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
8407 Points 
							576-792_1.PNG
6 months ago
Vikas TU
12276 Points 
							
Dear student 
Cos3A + Cos3B + Cos3C = 1 
2Cos3(A+B)/2 + Cos3(A-B)/2 = 1-Cos3C 
Sin3C/2 =0 
3C/2 =pi 
C = 2pi/3 
6 months ago
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