I don't want to disparage the author's hard work, as it was quite beautiful to look at, but as someone who already understands what he's talking about, I felt t

I don't want to disparage the author's hard work, as it was quite beautiful to look at, but as someone who already understands what he's talking about, I felt this was a terrible way to present it. (Like I say, it looked great, but I don't think it would aid a new student learning about complex numbers at all.) The notation he invents is confusing, too. That "1∠90°" just means a vector with length 1 and pointing 90° from the X-axis (which the author later changes to the Y-axis for no apparent reason). In my opinion, polar coordinates (which is what the notation represents) are a fascinating tool that can be very helpful. I use them quite a bit. Conflating that with complex numbers is confusing if you don't already understand both polar coordinates and complex numbers, in my opinion.