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There is a unique ordered pair \((c,d)\) such that \(c\phi^n + d\widehat{\phi}^n\) is the closed form for sequence \(A_n\).
Find \(c\) using the Fibonacci and Lucas number sequences.\(Let \begin{align*} A_0 &= 6 \\ A_1 &= 5 \\ A_n &= A_{n - 1} + A_{n - 2} \; \textrm{for} \; n \geq 2. \end{align*} \)
