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A.

\begin{matrix} f (x) = a_{0} + \infty \sum n = 1 a_{n} cos (ω x) \end{matrix}

B.

\begin{matrix} f (x) = \infty \sum n = 1 b_{n} sin (ω x) \end{matrix}

C.

\begin{matrix} f (x) = a_{0} + \infty \sum n = 1 b_{n} sin (ω x) \end{matrix}

D.

\begin{matrix} f (x) = a_{0} + \infty \sum n = 1 a_{n} cos (ω x) + \infty \sum n = 1 b_{n} sin (ω x) \end{matrix}

Q24