Angular momentum, spin etc — UPSC Physics Optional CSE 2018 Paper II
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Prove the following identities:
(i) [\hat{p}_x,\hat{L}_y]=i\hbar\hat{p}_z
(ii) e^{i(\hat{\sigma}\cdot\hat{n})\theta}=\cos\theta+i(\hat{\sigma}\cdot\hat{n})\sin\theta
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