inserting expression into integral with latex and pythonsage1

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I am trying to write some code where the user enters in a expression into a sage interactive and then my programs display the integral in latex. For example the user might enter in x^2 or sin(x) as bounds in my program. However,neither of these expressions works. when I use sin(x) as bound the s shows up as a bound but the in(X) shows up in the expression being integrated. when I put x^2 as a bound the integral does not show up and I get the message "Double Exponents use braces to clarify".

 s = "$\int_{2}^{3}  \int_{4}^{5} {0} \,dxdy = {1} $"

p = s.format(function, result,lower_x_bound,upper_x_bound,lower_y_bound,upper_y_bound)


html("%s" %p)