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-What's the square of I?
The square of -i is equivalent to the square of I, that is,-1.

The square of I is-1. Adding real numbers, I can perform four operations, which I call imaginary unit. If the imaginary part of an algebra contains letters, it is called the imaginary part.

Imaginary number and real number cannot be compared with size, nor can imaginary number and imaginary number be compared with size.

I hope it can help you solve the problem.