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Q. Find the modulus of $\frac{1}{1+i} \cdot$

Complex Numbers and Quadratic Equations

Solution:

Let $z=\frac{1}{1+i}$
$\therefore \,\left|z\right|=\left|\frac{1}{1+i}\right|$
$=\frac{1}{\sqrt{1+1}}$
$=\frac{1}{\sqrt{2}}$