<PRE><B>Question 770544</B>
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What you have so far is just right.  Now all you need are numbers to plug in for *[tex \LARGE \cos^2\left(-\frac{\pi}{4}\right)] and *[tex \LARGE \sin^2\left(-\frac{\pi}{4}\right)]


&lt;a href=&quot;http://en.wikipedia.org/wiki/File:Unit_circle_angles_color.svg&quot;&gt;Wikipedia Unit Circle&lt;/a&gt;


*[tex \LARGE -\frac{\pi}{4}\ =\ \frac{7\pi}{4}] is in QIV, where *[tex \LARGE \cos\varphi\ &gt;\ 0] and *[tex \LARGE \sin\varphi\ &lt;\ 0].  


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
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