I have the following from another source in an article I was reading:

Can anyone show the math on how to get from the second step to the third step as shown, Red arrow shows the step I am not understanding.

I get a different result when simplifying (if you want to call this simplifying)>>>

Can anyone show the math on how to get from the second step to the third step as shown, Red arrow shows the step I am not understanding.

I get a different result when simplifying (if you want to call this simplifying)>>>

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