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How to find cos(-19pi/6)
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How to find cos(-19pi/6)

User Informat
by
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1 Answer

4 votes
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
User Kartick Vaddadi
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