Can anyone explain how the $\text{(magnitude)}^2$ can be calculated with multiplying $\frac{1}{1-ae^{jw}}$ from this DTFT?

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Can anyone explain how the $(\text{magnitude})^2$ can be calculated with multiplying $\frac{1}{1-ae^{jw}}$ from this DTFT?

Provided here. Kindly click in to see the equation