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# Integration - Where have I made a mistake? watch

1. (Original post by TenOfThem)
You can

It is possible to split a numerator but not a denominator
Yup, sorry about that Do you know if Edexcel tell you if you the integration technique to use in a question?

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2. (Original post by TenOfThem)
You can

It is possible to split a numerator but not a denominator
And when doing integration by parts, say if I am integrating x^2(3+2x)^2 can I make u = (3+2x)^2 and v = x^2, I know I can make it the other way around...

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3. (Original post by ps1265A)
Yup, sorry about that Do you know if Edexcel tell you if you the integration technique to use in a question?

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Only for substitution
4. (Original post by ps1265A)
And when doing integration by parts, say if I am integrating x^2(3+2x)^2 can I make u = (3+2x)^2 and v = x^2, I know I can make it the other way around...

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You could do either

However .... You could just multiply that out
5. (Original post by TenOfThem)
You could do either

However .... You could just multiply that out
Alright thanks!

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6. (Original post by TenOfThem)
You could do either

However .... You could just multiply that out
I tried this with the follow Q, but I didn't get the same answer. They used u = ln|secx| instead:

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7. (Original post by ps1265A)
I tried this with the follow Q, but I didn't get the same answer. They used u = ln|secx| instead:

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differentiate ln(sec)
integrate sinx
8. (Original post by ps1265A)
I tried this with the follow Q, but I didn't get the same answer. They used u = ln|secx| instead:

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You cannot integrate ln so you should always differentiate the ln part in IBP
9. (Original post by TenOfThem)
You cannot integrate ln so you should always differentiate the ln part in IBP
Thanks!

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