# Solution in the interval

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• November 9th 2012, 03:21 PM
MarkFL
Re: Solution in the interval
On the unit circle, where is the x-coordinate of a point -1?
• November 9th 2012, 03:34 PM
Plato
Re: Solution in the interval
Quote:

Originally Posted by Darion
I'm sorry, I don't know how to use that.

To what does that refer?

Can you solve $\cos(x)=-1~?$
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