So if I use the chain rule to take the partial derivative with respect to t2 then I hold t1 to be a constant. I get the result:

Is this correct for the partial of the function with respect to t2 Now for the second partial: take partial of this with respect to t2 of e^{t_1+t_2-2+(1+e^{t_1})e^{t_2}}

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e^{t_1+t_2-2+(1+e^{t_1})e^{t_2}}

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and I get e^{-2}e^{t_2}e^{t_2}e^(1+e^{t_1})e^{t_2}}

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e^{-2}e^{t_2}e^{t_2}e^(1+e^{t_1})e^{t_2}}

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I tried to use your Latex generated formulas to write out my results. I hope this is the correct way to do it. I saw the tutorial on Latex on the website but am not sure how to input into my messages. Do you go offsite to do that or do you put the equations directly into the message using the Latex code? Thanks again Fred1956