If \( \sin \theta_{1}+\sin \theta_{2}+\sin \theta_{3}=3 \), then \( \cos \theta_{1}+\cos \theta_...
If \( \sin \theta_{1}+\sin \theta_{2}+\sin \theta_{3}=3 \), then \( \cos \theta_{1}+\cos \theta_{2}+\cos \theta_{3}= \)
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