Question 983776
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*[tex \LARGE \sin\phi] is positive in QI and QII.


Look at the unit circle and find the angles in QI and QII where the unit circle *[tex \Large y]-coordinates are equal to *[tex \LARGE \frac{\sqrt{2}}{2}].


 *[illustration unit_circle]


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

*[tex \Large \ \
*[tex \LARGE \ \ \ \ \ \ \ \ \ \