If $P + Q = R$ and $| P |=| Q |=\sqrt{3}$ and $| R |=3$, then the angle between $P$ and $Q$ is
- A$\pi / 4$
- B$\pi / 6$
- C$\pi / 3$
- D$\pi / 2$
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- [JEE MAIN 2024]
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