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ibis121 ibis121
  • 06-12-2014
  • Mathematics
Answered

how to find cos(-19pi/6)

Verified Answer :

jamiealt123 jamiealt123
  • 06-12-2014

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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