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I'm not getting the error you have, but I do get something that doesn't look right. Perhaps you should first take your input box inputs and make them LaTeXed, e.g.

      q = r"$\int_{0}^{1}\int_{2}^{3} {4} \,dx\,dy = {5}$".format(lower_y_bound, upper_y_bound,lower_x_bound, upper_x_bound,latex(function), latex(result))

You were missing an underscore, anyway. How do you get the error you mention?