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8. For two angular momenta of quantum numbers j₁ and j2, there are
(2j1 + 1) × (2j2 + 1) possible products |j1,m,)|j2,m,,) of eigenstates of
the individual angular momenta. Count all the possible eigenstates
lj,mj) of the total angular momentum, and show that there are exactly
(2j1 + 1) × (2j2 + 1) such eigenstates.

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