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Grade: 11 
        
if a = 2pie/7, then S = (sin a + sin 2a + sin 3a) which can be represent by (root p)/q. Find p+q ? 
3 years ago

Answers : (1)

Saurabh Koranglekar
askIITians Faculty
6117 Points 
							please refer

https://www.askiitians.com/forums/Trigonometry/if-a-2-7-find-sina-sin2a-sin4a-in-therms-of_148501.htm
one year ago
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