Question: How to show chain rule when diff?

how to show chain rules result when diff this

Eq1 := f(x,g(x,t)) + f(x,y);
diff(Eq1, x);

 http://math.stackexchange.com/questions/372093/chain-rule-definition-f-fx-gx-y

https://drive.google.com/file/d/0Bxs_ao6uuBDUanVWYm1SMWc4R3M/view?usp=sharing

 

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