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Question: Not the correct output?

Question:Not the correct output?

janhardo 850
differential-geometry
1 hour ago
0

No matter what I try to get a component output, it does not work. 

 

restart;
with(DifferentialGeometry):
DGsetup([theta, phi], S2);
X := evalDG(D_theta + 2*D_phi);
X(cos(theta));




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