[Taken from Basic Engineering Circuit Analysis, 10th Ed. Irwin.]
\(
\begin{align}
i(t) &= A \cos(\omega t+ \phi)
i(t) &=A \cos(\phi)\cos(\omega t) - A \sin(\phi) \sin(\omega t)
\end{align}
i(t) =A \cos(\omega t) + A \sin(\omega t)
\)
And they decided to just make cos(phi) = 1 = sin(phi), Why did this happen?
(here is the rest of the example, which I dont think provides explanation)
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