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Could anyone please explain me the steps in these pictures.

I do not understand the second step.

http://imgur.com/AvVbPu5,Ust2Zpx#0

Second one:

Third step ( i don't understand)

http://imgur.com/AvVbPu5,Ust2Zpx#1

If anyone can give me detail explanation, i would really appreciate it.

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# Partial Derivative Explanation

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