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| 1. |
\begin{array}{c}{\sin \left(\frac{\pi}{3}-B\right) \cdot \cos \left(\frac{\pi}{6}+A\right)=\cos (A} \\ {\cos \left(\frac{\pi}{4}-x\right) \cdot \cos \left(\frac{\pi}{4}-y\right)-}\end{array} |
| Answer» | |