Chapter 6 Excercise 10

[ArnolFokam]

Hi @ilmoi, firstly, thanks for this incredible work. It as helped me so much. While solving Question 10 in Chapter 6. I came across an abnormality in your calculations for its solution.

I think that in places where I put an exclamation mark, there is supposed to be a power to -1 if we expand the bracket correctly. Furthermore, I maybe wrong, or missing the point somewhere. This is why, it would be really helpful for me if anybody could help me solve this issue.

Thanks.