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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.
Re(1+\left(-1-1\right)i)
Combine the real and imaginary parts in numbers 1-i and -i.
Re(1-2i)
Add -1 to -1.
1
The real part of 1-2i is 1.