Hello,(adsbygoogle = window.adsbygoogle || []).push({});

I hope everyone is well.

Also, I hope someone can help me understand something. I am trying to understand how cos(ω_{1}t) times cos(ω_{2}t) can be represented as

x(t) 1/2 (cos(ω_{2}- ω_{1})t) + 1/2 (cos(ω_{2}+ ω_{1})t)

Thanks in advance for any help.

Seán

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# Multiplying cosines

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