SOLUTION: given that sin pi/8 = 0.38268, use identites to find cos pi/8

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Question 607195: given that sin pi/8 = 0.38268, use identites to find cos pi/8
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: use the idea that . We can solve for cosine to get

Note: the sign of the result will depend on which quadrant the angle lies.