Find the modulus of `(1+i)/(1-i)-(1-i)/(1+i)`

Explanation

To find the modulus of the expression \((1+i)/(1-i)-(1-i)/(1+i)\), we can follow these steps:

### Step 1: Write the expression
We start with the expression:
\[ \frac{1+i}{1-i} - \frac{1-i}{1+i} \]

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