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sage: mymatrix.apply_map(lambda z: z.expr())
[f(t, r, th, ph) + g(t, r, th, ph)                   g(t, r, th, ph)                                 0]
[                  f(t, r, th, ph)                                 0                   g(t, r, th, ph)]
[                                0                   g(t, r, th, ph)                   f(t, r, th, ph)]