Evaluate the commutator[L, L,·Ly]. (a) ħ²Lx (b) 0 (c) ħ²L, (d) ħ²L₂
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A: Given, A = −12mˆi + 4.0mˆj + 1.5mˆk B = 2.8Nˆi − 21Nˆk
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Q: magnitude of A
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