(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

I have an assignment that is based on the forumal

A sin x + B cos x = K sin(x+ φ).

I need to: 1.Explain why we might need such a formula

2. Show proof or dervivation of this formula on which you add in english the

reasons for each step. (I know how to go from A sin x + B cos x to K sin(x+ φ))

3.Describe a real application of this formula

2. Relevant equations

A sin x + B cos x = K (sin x cos φ + cos x sin φ) = K sin(x+ φ).

3. The attempt at a solution

I have done a lot of searching and have come up with nothing...

Any help is appreciated

Thanks

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