Edexcel C4 integration

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  1. iAre Teh Lejend's Avatar
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    Edexcel C4 integration
    There are so many ways to integrate. How can I instantly realise which method I am supposed to use if they do not state it ?
  2. iAre Teh Lejend's Avatar
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    Re: Edexcel C4 integration
    Anyone ?
  3. kozo's Avatar
    • Junior Member
    • Posts: 34
    Re: Edexcel C4 integration
    With all due respesct you have had x months to learn it yet want someone to tell you within 50 minutes of you first asking.

    You can do some by inspection, ie reversing the chain rule
    You can do some by parts, which often you are told to do, which will be where you have a product
    You may get f'(x)/f(x) which will give you ln|f(x)|
    Some trig intergals will just be done by standard results
    Some you can just expand and integrate as a sum (as you would have done in C1/C2)

    Its about taking time to learn and spot them.
  4. iAre Teh Lejend's Avatar
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    • Posts: 651
    Re: Edexcel C4 integration
    (Original post by kozo)
    With all due respesct you have had x months to learn it yet want someone to tell you within 50 minutes of you first asking.

    You can do some by inspection, ie reversing the chain rule
    You can do some by parts, which often you are told to do, which will be where you have a product
    You may get f'(x)/f(x) which will give you ln|f(x)|
    Some trig intergals will just be done by standard results
    Some you can just expand and integrate as a sum (as you would have done in C1/C2)

    Its about taking time to learn and spot them.
    With all due respect ? I know integration well, I think you havn't read my post properly. I am asking, if there is an easier way to notice what method to use, because some times i end up trying a method that doesnt work for a particular case and then i have to get it on my second attempt with another method. Like substitution and by parts, theyre used in two similar cases. I'm simply asking if anyone has any tips in spotting which method to use. No need to troll on this thread.
    Last edited by iAre Teh Lejend; 10-06-2012 at 15:56.
  5. kozo's Avatar
    • Junior Member
    • Posts: 34
    Re: Edexcel C4 integration
    Ok, I shall sit back and happily read a post that can condense all the integrals for polynomial and transcendental functions in an all encompassing sweep.
  6. iAre Teh Lejend's Avatar
    • Benevolent Member
    • Posts: 651
    Re: Edexcel C4 integration
    (Original post by kozo)
    Ok, I shall sit back and happily read a post that can condense all the integrals for polynomial and transcendental functions in an all encompassing sweep.
    Cool story bro.
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