Level:
Project ID:
1003067708
Accepted:
1
Clonable:
1
Easy:
0
Let \( z=\frac{1-\mathrm{i}}{1+\mathrm{i}}+\frac{1+\mathrm{i}}{1-\mathrm{i}} \). If \( z \) is a complex number, find its absolute value.
\( 0 \)
\( 2 \)
\( 4 \)
Number \( z \) is not a complex number.