Current Events > Weekly "Help Hexenherz with Homework if you have time" topic -_-

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Two different questions but they seem like they're asking the same thing?

1 - Determine the values of x, 0 <= x < 2pi, such that cos(x) equals (square root of three) divided by 2.

2 - List all values of x such that cos(x) equals (square root of three) divided by 2.

How do these differ?

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The only thing I can think of is maybe the first is asking what the periodicity / recurrence rate is in the first one and then the second is asking what the specific angle measurement would be. Or maybe the other way around...

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1. /6, 5/6, 7/6, 11/6
2. n1/6, n Z

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Get your circle graph of trig values out and use that

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Garioshi posted...

1. /6, 5/6, 7/6, 11/6
2. n1/6, n Z

How do you get pi/6, 5pi/6 and the others? I calculated out pi/3, 2pi/3 >_>

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Though I plugged your values in and they were all correct so now I have to spend half an hour figuring out wtf I am doing wrong.

Big part of it is that stupid square root of 3 tripping me up.

edit: I am so stupid, I kept running arccosine and then treating the result as if it were from the actual cosine function instead of just taking it as the degree measurement and running with it -_-. Thanks @Garioshi

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