
To explain: The sum and difference identities are used to describe wireless internet interferences.

Explanation of Solution
Given:
The explanation should include the explanation of the difference between constructive and destructive interference.
For the determination of the wireless internet interference, it uses the sine/cosine of the sum/difference of 2 angles.
Since, the interference occurs at a time where the wave passing from the same space at same time.
It occurs when the two waves combine to have the greater or smaller amplitude than a component waves.
If the amplitude of the combined wave is greater then the constructive interference will occur.
And if the amplitude is smaller then the destructive interference will occur.
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