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Real Part
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|1+\left(-1-1\right)i|
Combine the real and imaginary parts in numbers 1-i and -i.
|1-2i|
Add -1 to -1.
\sqrt{5}
The modulus of a complex number a+bi is \sqrt{a^{2}+b^{2}}. The modulus of 1-2i is \sqrt{5}.