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Bridger Mclean
Mathematics
21 October, 09:24
How to find cos (-19pi/6)
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Cameron Chaney
21 October, 09:25
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Use the unit circle.
-19pi/6 is the same as 3pi + pi/6
This means that it goes around the unit circle 3pi times and ends up at 7pi/6
So - 19pi/6 is equivalent to 7pi/6.
Looking at the unit circle, cos (7pi/6) = - √3/2
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