Write `1-i` in polar form.

Explanation

To write the complex number \( 1 - i \) in polar form, we will follow these steps:

### Step 1: Identify the complex number
The given complex number is \( z = 1 - i \). Here, the real part \( x = 1 \) and the imaginary part \( y = -1 \).

### Step 2: Calculate the modulus \( r \)
The modulus \( r \) of a complex number \( z = x + iy \) is given by the formula:
\[
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