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21 October, 09:24

How to find cos (-19pi/6)

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  1. 21 October, 10:22
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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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