\[ \begin{array}{l} \sin (\beta-\gamma) \cos (a-\delta)+\sin (\gamm...

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\[
\begin{array}{l}
\sin (\beta-\gamma) \cos (a-\delta)+\sin (\gamma-a) \cos (\beta-\delta) \\
+\sin (a-\beta) \cos (\gamma-\delta)=0
\end{array}
\]
\( \mathrm{P} \)
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