SOLUTION: how would i prove that when 17pi over 18 and 13pi over 18 make 1-2sin3x=0?

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Question 787428: how would i prove that when 17pi over 18 and 13pi over 18 make 1-2sin3x=0?
Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
Replace x in the trig equation given with
17pi/18 and simplify.
Do the same by letting x be 13pi/18.
The left side should result to zero after doing the math.