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The value of Sin 2π/7+sin4π/7+sin8π/7 is a)√7/8 b) 1/8 c) √7/2 d)-√7/2

The value of Sin 2π/7+sin4π/7+sin8π/7 is a)√7/8 b) 1/8 c) √7/2 d)-√7/2

Grade:12

2 Answers

mycroft holmes
272 Points
6 years ago
For want of time, I am writing out the solution in two parts. I am posting the first part now. Will be posting the second part in some time.:
mycroft holmes
272 Points
6 years ago
Continuing from where we left off, we need to evaluate the sum within the brackets now. For this we look at the denominator for inspiration. 
 

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