The horizontal line indicates that he is adding two complex quantities together. Since they are in different notations, he has to convert the polar representation of to a rectangular one. Then he can add two rectangular quantities together, and then convert back to polar. I disagree on this digits, but the method is sound.Hello again, I have another question. In this problem towards the bottom right of the page, he goes from "j20.36 + 88.10<-84.95" to "0 + j20.36". I'm assuming that the 88.10 cancels out somehow since the degree is negative, but I'd like some clarification on why that is. Also, I have no idea how he goes to the next step from that, where he says "7.755 -j87.76 / 7.755 - j67.40"
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