Question 672290
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Hi,
8(cos(7pi/4) + isin(7pi/4))= {{{8(sqrt(2)/2 - i*sqrt(2/2)) = 4sqrt(2)- 4sqrt(2)*i}}}
Thought this (cosx,sinx) summary may be useful in Your studies:
<img src="http://www.math.ucsd.edu/~jarmel/math4c/Unit_Circle_Angles.png">