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Matrix (Page: 10)
Question No: # 92
If $ f(x) = \begin{bmatrix} cos\ x & - sin\ x & 0 \\ sin\ x & cos\ x & 0 \\ 0 & 0 & 1 \end{bmatrix} $, then prove that `f(\alpha)\cdot\f(\beta) = f(\alpha+\beta)`.
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