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It seems you want to plot a curve in 3d, parametrized by t.

The example provided in the question has problems:

• parentheses don't match
• the entries involve
  • non-real complex numbers, like e^(1/4*pi), e^(1/2*pi), e^(-1/2*pi)
  • the derivative of the real_part function

Here is an example of plotting a parametric curve in 3d:

sage: M(t) = (t + 1, 2 * t - 1, 3 * t)
sage: parametric_plot(M, (-2, 2), color="red")

It could be adapted to the example from the question, once fixed.