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Question 1
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If $F(\theta)=\begin{bmatrix}{\cos \theta} & {-\sin \theta} & {0} \\ {\sin \theta} & {\cos \theta} & {0} \\ {0} & {0} & {1}\end{bmatrix}$ , then $F(\theta)F(\alpha)$ is equal to
A.
$F(\theta\alpha)$
B.
$F(\frac{\theta}{\alpha})$
C.
$F(\theta+\alpha)$
D.
$$F(\theta-\alpha)$$
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