Question: This is the problem I'm working on Show how to find E(XY ) from the joint moment-generating function of X and Y . Hint: please

This is the problem I'm working on "Show how to find E(XY ) from the joint moment-generating function of X and Y . Hint: please use the Taylor expansion of a real function with two variables" I put the partial derivative into the equation but now I'm stuck. Not even sure if I did the first part right actually.

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