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the formula is correct or not?

Posted 10 years ago

enter image description here

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!

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POSTED BY: John tiger
Posted 10 years ago

Problem has been solved! Thank you for your attention!

the formula is correct!

POSTED BY: John tiger
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