Question 452187
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You need the two places *[tex \LARGE \sin\theta\ =\ 0]


See the unit circle, recalling that on the unit circle, the *[tex \LARGE y]-coordinate is the value of the *[tex \LARGE \sin]


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


John
*[tex \LARGE e^{i\pi} + 1 = 0]
My calculator said it, I believe it, that settles it
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