Ononot — Consider the matrix A = \begin{pmatrix} 1 & 1 & 1 \\ \cos\al

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Determinantshard

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Consider the matrix $A = \begin{pmatrix} 1 & 1 & 1 \\ \cos\alpha & \cos\beta & \cos\gamma \\ \cos 2\alpha & \cos 2\beta & \cos 2\gamma \end{pmatrix}$ Which of the following expressions is/are equivalent to $\det(A)$ ?