Find where cosθ = -0.8660, where (0 degrees ≤ θ < 540 degrees)(adsbygoogle = window.adsbygoogle || []).push({});

I am not sure how to solve this problem

I did: cosθ + 0.8660 = 0

Then I am not sure what to do

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# Homework Help: Solving Trigonomic Inequalites

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