Question: indefinite double integration issue

Hello,

 

I'm having a problem evaluating an indefinite integral in MAPLE 14.  I am unfortunately unable to copy/paste the code in here, but the problem is relatively simple.

 

I have an expression as f(x,y) and am using the "expressions" (as opposed to "int" commands) to setup up the dbl integral.  When I run the code, it is only integrating with respect to one variable.  The answer is returned as the f(x,y) integrated with respect to x, but then it is left as an unsolved indefinite integral with respect to f. 

 

I think I am missing something small here.  Any help would be appreciated!!

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