If I have 2 cosine terms added together, how would I combine them into one cosine term?(adsbygoogle = window.adsbygoogle || []).push({});

Ex:

A) 3 cos(2t)

B) cos(2t - pi/2)

Thanks

PS. I don't think the sum to product formulas work, I'm wondering how to combine them into a single cosine term?

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# Combining two trig terms into one?

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