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You are unfortunately facing a known issue, which is not solved yet:

https://trac.sagemath.org/ticket/25034

Associated Legendre functions and spherical harmonics in Sage require someone to work of them. Would you volunteer to do it?

You are unfortunately facing a known issue, which is not solved yet:

https://trac.sagemath.org/ticket/25034

Associated Legendre functions and spherical harmonics in Sage require someone to work of them. Would you volunteer to do it?

sage:  gen_legendre_P(2, 2, x)                                                                      
-3*x^2 + 3