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已知 $\cos \left(\alpha+\frac{\pi}{12}\right)=\frac{3}{5}, \alpha \in\left(0, \frac{\pi}{2}\right)$, 则 $\cos \left(\alpha+\frac{\pi}{3}\right)=(\quad)$
A. $\frac{3-4 \sqrt{3}}{10}$     B. $\frac{4}{5}$     C. $-\frac{\sqrt{2}}{10}$     D. $\frac{7 \sqrt{2}}{10}$         
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