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# Help with Maclaurin Series watch

1. Hi people,

Need help with the following:

Find Maclauring Series of: sin^3(x), ln[(1+x)(1-2x)^2]

I tried the first one but the derivatives just become worse and the other one is just long after doing all the derivatives.

I am really struggling on understanding even the basic ones so it would be helpful if anyone has good resource from which I can at least understand.

Thanks
2. (Original post by mathsRus)
Hi people,

Need help with the following:

Find Maclauring Series of: sin^3(x), ln[(1+x)(1-2x)^2]

I tried the first one but the derivatives just become worse and the other one is just long after doing all the derivatives.

I am really struggling on understanding even the basic ones so it would be helpful if anyone has good resource from which I can at least understand.

Thanks
Sin x and ln(1+x) have "basic series expansions " according to the book I'm using and are in the AQA blue formula book so if you are on a different exam board check out your formula book.

If you have to derive the expansions from first principles then the AQA FP3 booklet (free online from the AQA website) might be of use.

I hope this reply hasn't contravened the TSR rules.

Hope it is of use to you.
3. (Original post by maggiehodgson)
Sin x and ln(1+x) have "basic series expansions " according to the book I'm using and are in the AQA blue formula book so if you are on a different exam board check out your formula book.

If you have to derive the expansions from first principles then the AQA FP3 booklet (free online from the AQA website) might be of use.

I hope this reply hasn't contravened the TSR rules.

Hope it is of use to you.
As this comes at university, I am not allowed to use a formula book.

I still did not get answer for sin^3(x). I thought I can do like (sinx)^3 -> do the maclaurin series for the sinx and put that (series)^3 but it didn't give me the answer.

Any further recommendation or have I done the method incorrectly?

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Updated: January 9, 2015
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