Question Let \( O \) be the origin, and \( \overrightarrow{O X}, \overrightarrow{O Y}, \overrigh....

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Question
Let \( O \) be the origin, and \( \overrightarrow{O X}, \overrightarrow{O Y}, \overrightarrow{O Z} \) be three-unit
\( \mathrm{P} \)
vectors in the directions of the sides \( \overrightarrow{Q R}, \overrightarrow{R P}, \overrightarrow{P Q} \), respectively, of a triangle \( P Q R \).
\( |\overrightarrow{O R} \times \overrightarrow{O Y}| \) is equal to
(1) \( \sin (P+R) \)
(2) \( \sin 2 R \)
(3) \( \sin (P+Q) \)
(4) \( \sin (Q+R) \)


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