
The third step scientific error, however, the book and the professor says it is 100% correct Please, I want to interpret and explain clearly her and thank you.

The third step scientific error, however, the book and the professor says it is 100% correct Please, I want to interpret and explain clearly her and thank you.
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I don't this has an error in it. In that third line the exponential is split by its multiplication rule, then e^ln(1+x) is simplified to 1+x.
What do you think it should be?