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No, not necessarily. Cosine theta is equal to 1 only when theta is equal to zero and multiples of 2 pi radians or multiples of 360 degrees. This is because cosine theta is hypotenuse over adjacent, and the ratio 1 only occurs at 0, 360, 720, etc. or 0, 2 pi, 4 pi, etc.

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Q: Is cos theta is equal to 1?
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How do you solve theta if cos squared theta equals 1 and 0 is less than or equal to theta which is less than 2pi?

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