SOLUTION: Use the unit circle to find the value of cos(2π/3) and even or odd trigonometric functions to find the value of cos(-2π/3).
So first what I did was find the cos given
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Question 863357: Use the unit circle to find the value of cos(2π/3) and even or odd trigonometric functions to find the value of cos(-2π/3).
So first what I did was find the cos given on the unit circle which gives me (-1/2,sqrt(3)/2). Cos represents x of the point so cos(2π/3) is -1/2.
Then I don't know how to use even or odd functions to find the second cos.
Thank you.
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Fundamental Identity
cos(-θ) = cos θ,
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