# Next, the real and imaginary sums must be examined to determine when the are equal to 0. These sums each regularly alternate between positive and negative terms due to the -1 in the numerator. However, further alternating can occur due to the sine and cosine functions. The portion of alternating due to the -1 can be separated by splitting the sums into their even and odd terms.

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# The task now is to determine when the positive portions of the even and odd sums cancel the negative portions, for both the real and imaginary sums.