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Integration - Where have I made a mistake?

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Reply 20
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ps1265A
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Original post by TenOfThem
You can

It is possible to split a numerator but not a denominator


Yup, sorry about that :smile: Do you know if Edexcel tell you if you the integration technique to use in a question?


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Reply 21
Avatar for ps1265A
ps1265A
OP
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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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Original post by ps1265A
Yup, sorry about that :smile: Do you know if Edexcel tell you if you the integration technique to use in a question?


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Only for substitution
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
Reply 24
Avatar for ps1265A
ps1265A
OP
14
Original post by TenOfThem
You could do either

However .... You could just multiply that out


Alright thanks!


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Reply 25
Avatar for ps1265A
ps1265A
OP
14
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:

ImageUploadedByStudent Room1422122681.341146.jpg


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Reply 26
Avatar for TeeEm
TeeEm
19
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:

ImageUploadedByStudent Room1422122681.341146.jpg


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differentiate ln(sec)
integrate sinx
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:

ImageUploadedByStudent Room1422122681.341146.jpg


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You cannot integrate ln so you should always differentiate the ln part in IBP
Reply 28
Avatar for ps1265A
ps1265A
OP
14
Original post by TenOfThem
You cannot integrate ln so you should always differentiate the ln part in IBP


Thanks!


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