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Did you mean: lcm (1 ,-1 ,zeta ,pi )?

Y*l*m(1,-1,theta,phi)

Evaluate with respect to…

solve(Y*l*m(1, -1, theta, phi), phi)
diff(Y*l*m(1, -1, theta, phi), phi)
series(Y*l*m(1, -1, theta, phi), phi, 0, 10)
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