Question 1102568
cos(x) = 2 + i
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take the inverse cosine of both sides to eliminate the cosine from the left hand side.
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x = 2 * π * n(1) + cos^(-1)(2 + i) for n(1) element of Z
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or x = 2 * π * n(2) - cos^(-1)(2 + i) for n(2) element of Z
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Z is the set of integers
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