SOLUTION: I really need your help with finding an exact value while using an reference angle! Expression: cos 13pi/ 6 I thought the answer would be pi/6

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Question 490915: I really need your help with finding an exact value while using an reference angle! Expression: cos 13pi/ 6
I thought the answer would be pi/6
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
It's cos(pi/6)
= sqrt%283%29%2F2