Question 238114
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<img src="http://www.math.ucsd.edu/~jarmel/math4c/Unit_Circle_Angles.png">


On the unit circle, *[tex \Large y\ =\ \sin\Theta] and *[tex \Large x\ =\ \cos\Theta].  *[tex \Large y] is positive above the *[tex \Large x]-axis, and *[tex \Large x] is positive to the right of the *[tex \Large y]-axis.


John
*[tex \LARGE e^{i\pi} + 1 = 0]
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