<PRE><B>Question 806606</B>
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Take a look at the unit circle.  The *[tex \LARGE x]-coordinate of a point on the unit circle is the cosine of the angle formed by the ray from the origin passing through that point.  Cosine is positive in the first and fourth quadrants.


&lt;a href=&quot;http://www.thattutorguy.com/unit-circle-pdf/&quot;&gt;Unit Circle&lt;/a&gt;


With acknowledgement to &quot;ThatTutorGuy&quot; on thattutorguy.com.


John
*[tex \LARGE e^{i\pi}\ +\ 1\ =\ 0]
&lt;font face=&quot;Math1&quot; size=&quot;+2&quot;&gt;Egw to Beta kai to Sigma&lt;/font&gt;
My calculator said it, I believe it, that settles it
&lt;div style=&quot;text-align:center&quot;&gt;&lt;a href=&quot;http://outcampaign.org/&quot; target=&quot;_blank&quot;&gt;&lt;img src=&quot;http://cdn.cloudfiles.mosso.com/c116811/scarlet_A.png&quot; border=&quot;0&quot; alt=&quot;The Out Campaign: Scarlet Letter of Atheism&quot; width=&quot;143&quot; height=&quot;122&quot; /&gt;&lt;/a&gt;&lt;/div&gt;
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