Need help with pre-calculus

[Dkit_05]

prove A sin(ωt+φ)=c₂sinωt+c₁cosωt

 

[Dr.Peterson]

prove A sin(ωt+φ)=c2sinωt+c1cosωt

Just apply the angle-sum identity for the sine. Clearly you are expected to have learned it. Give it a try!

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