WignerD
WignerD[{j,m1,m2},ψ,θ,ϕ] gives the Wigner D-function Dm1,m2j(ψ,θ,ϕ).
WignerD[{j,m1,m2},θ,ϕ] gives the Wigner D-function Dm1,m2j(0,θ,ϕ).
WignerD[{j,m1,m2},θ] gives the Wigner D-function Dm1,m2j(0,θ,0).
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