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5:20
Khan Academy
Sal Khan
Intro to the imaginary numbers
Learn about the imaginary unit, \"i\", a unique number defined as the square root of -1. It's a key part of complex numbers, which are in the form a + bi. The powers of \"i\" cycle through a set of values.
Jul 11, 2011
Imaginary Number Math
Understanding imaginary numbers and how they really work
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