We emphasized the equivalence of the solution forms (6), (7), and (8), and discussed the equations (10a,b) that relate C and D in (7) to E and ∮ in (8). Of course, we could have used the cosine in place of the sine, and expressed
x(t) = G cos (wt + ψ)
instead. Derive formulas analogous to (10a,b), expressing G and ψ in terms of C and D.
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