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Question, in order to produce a 270 degree geometric rotation of the complex number (a + bi), would this be correct:

(a + bi) * (-i)

It seems logical since a 90 degree rotation results from (a + bi) * (i)

Next question. What would be the equations for rotation of (a + bi) by 45 degrees, 135 degrees, 225 degrees ?

Thanks for help.

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# Geometric rotation of (a + bi)

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