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The title statement is meaningless. "Imaginary numbers" are not "multiply" by "90°". What does it even mean to "multiply" by an angle?

Correct statement: "*i is equivalent to a 90° rotation in some contexts." Which is kind of obvious to anybody who has done some maths or physics at some point?

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Trivially, this result is clearly obvious.

I swear the only time I ever heard trivial in a lecture was once I got into university. It's a whole new ball game; high school teachers wouldn't dare say trivial just in case they had someone who was behind.

No it's not. i is a number such that i^2 = -1 by definition.

And in some contexts -1 is rotating by 180 degrees, which happens to be 290, or i*i.

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