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To the nearest degree, determine all possible values of θ in the domain -360° ≤ θ ≤ 360° given cos θ = 1/3.

 

When I did inverse cos, I got approximately 71°. The other suitable coterminal angle would be -289°. However, my textbook got an answer of -79° and 289°. Is this an error, or did I do something wrong? And if I did, how would I get the correct answer?

 Mar 25, 2020
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To the nearest degree, determine all possible values of θ in the domain -360° ≤ θ ≤ 360° given cos θ = 1/3.

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 Mar 25, 2020

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