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Hi all.

Today I had to solve: [itex]\cos \theta = -1/2[/itex]. What I did was to look in a table to find that [itex]\theta = 2\pi/3 \quad \text{and}\quad \theta = 4\pi/3[/itex].

My question is what is the general strategy when I wish to write this as a a function of an integern? Is there even a general strategy for this?

Thanks in advance.

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# Trigonometric functions and the unit circle

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