How do you evaluate cos (-8pi/3)?

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How do you evaluate cos (-8pi/3)?

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Answer 1 · 2015-11-26T22:25:26

Evaluate $cos (\frac{- 8 π}{3})$ $cos ((-8pi)/3)$

Explanation:

Unit circle and Trig Table of Special Arcs -->
$cos (\frac{- 8 π}{3}) = cos (\frac{- 2 π}{3} - \frac{6 π}{3}) = cos (\frac{- 2 π}{3} - 2 π) = cos (\frac{- 2 π}{3}) = cos (\frac{2 π}{3}) = - \frac{1}{2}$ $cos ((-8pi)/3) = cos ((-2pi)/3 - (6pi)/3) = cos ((-2pi)/3 - 2pi) = cos ((-2pi)/3) = cos ((2pi)/3) = -1/2$

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How do you evaluate cos (-8pi/3)?

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