Contents
Simplify this summation
$ \sum_{n=-42}^5 3^{n+1} (1+j)^n $
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Answer 1
TA's comments: Any complex number can be written as one single complex exponential. i.e. $ a+jb=\sqrt{a^2+b^2}e^{j\theta}, where\ tan\theta = \frac{b}{a} $
Answer 2
Write it here.
Answer 3
write it here.
