the formula is correct or not?

ygxing1 · September 7, 2015, 7:12am

please look at the pic.
I do not know whether the 4-th line is correct or not.
The formula is from the file, which is colored in yellow.

Roughly I think it is correct.
But I do not know how to prove it.

Thank you very much!

ygxing1 · September 8, 2015, 7:42am

Problem has been solved!
Thank you for your attention!

the formula is correct!

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