What's your favorite illustration of the usefulness of complex numbers?
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This is actually proving the derivatives of trig functions tho
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I was t brilliant at maths in the '60s but I love to think I can actually understand this. It is so perfect, somehow.
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@bencbartlett be more like Elizabeth - 1 more reply
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That's pretty nice, actually.
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Actually it IS cute. :)
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However proving Euler's formula requires knowing derivatives of trig functions (since the proof is based on their Taylor series)
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Beautiful
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Touched on complex numbers again briefly in Dynamics and Control Systems yesterday, and this was actually very useful just now.

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