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You would better use differential forms directly

 sage: x, y, z = var('x, y, z')
sage: U = CoordinatePatch((x, y, z))
sage: F = DifferentialForms(U)
sage: form0 = DifferentialForm(F, 0, x^3*y^5)
sage: form0
sage: form0.diff()
3*x^2*y^5*dx + 5*x^3*y^4*dy

The exterior product is also implemented

sage: dx = DifferentialForm(F,0,x).diff()
sage: dy = DifferentialForm(F,0,y).diff()
sage: dx*dy
sage: dy*dx

You can access the documentation by typing

sage: DifferentialForm?

and then press enter. Alternatively, you can have a look to differential forms in the reference manual.