(All Steps) Let W be the space of functions spanned by cos (2 t), sin (2 t). Define D: W \rightarrow W
Question: Let \(W\) be the space of functions spanned by \(\{\cos (2 t), \sin (2 t)\}\). Define
\[\begin{aligned} &D: W \rightarrow W \\ &f \mapsto f^{\prime \prime}-f \end{aligned}\]
Find the matrix of \(D\) with respect to the basis \(\{\cos (2 t), \sin (2 t)\}\).
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