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i is the symbol for an imaginary number, a complex number with the property i2=-1. The square root of a negative number is the square root times i. For example, the square root of -9 = 3i.

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โˆ™ 2017-12-29 00:11:12
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โˆ™ 2017-12-29 05:48:29

The italic i denotes the square root of negative one.

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