I want to calculate the Maclaurin series for by using a previous result, that

The following is not correct, but I don't know why, nor how to do it the right way

let . Then

Thanks for any help.

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- Oct 9th 2009, 03:51 AMHD09Maclaurin series expansion
I want to calculate the Maclaurin series for by using a previous result, that

The following is not correct, but I don't know why, nor how to do it the right way

let . Then

Thanks for any help. - Oct 9th 2009, 05:09 AMJester
- Oct 9th 2009, 06:24 AMHD09
Because my solutions say so and the long-way calculation I did (which turns out to have a mistake in it now I check again) agreed with those instead of this!! Thanks. I was flabbergasted at how this could possibly be incorrect... what a relief.

- Oct 9th 2009, 06:35 AMHallsofIvy
Now you've got me curious! What was the "solution sheet" answer that "the long way" agreed with?

- Oct 9th 2009, 07:00 AMHD09
It only gave the first two terms but the solutions claim the co-efficient of the second term is 1/4 rather than 1/2