Today I have been working with the sage function "spherical_harmonic" and have had problems reproducing the tabulated results for these functions. For example, "spherical_harmonic(2, 1, theta, phi)" gives results that are wrong in a minus sign and happen similarly with other parameters. However, I use the sympy library function that I thought was the default for symbolic calculations in SageMath and you can see that it works correctly. Could it help me understand what's going on?
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