Question 1102568: Ref # 1102550
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cos(x) = 2
Solve for x.
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As an example from my book:
cos(+/-arctan(2sqrt(6)/5) - i*ln(7) + n*2pi) = 10
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--> cos(x) = 10
x = +/-arctan(2sqrt(6)/5) - i*ln(7) + n*2pi
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If cos(x) = 10 has a solution,
I think cos(x) = 2 does also.
I solved that years ago, but I don't remember how to do it now.
I will figure it out, with or without help.
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Then I wonder about cos(x) = 2 + i ???
Answer by rothauserc(4718)   (Show Source):
You can put this solution on YOUR website! 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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