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    Guys, what'd you think is more helpful at this point? Soloman papers or gold paper?
    ( i've done a couple of each but not all)


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    (Original post by MrBowcat)
    Was that IAL?
    yup
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    Wouldn't mind a really nasty differential equation question, but a really nice vectors question.
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    (Original post by joe1545)
    Wouldn't mind a really nasty differential equation question, but a really nice vectors question.
    ditto
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    (Original post by FKA Stiglitz)
    When you have your binomial expansion in the form (1+ax)^n, it's valid for mod x < 1/a; for example a=2 so 2x, it's valid for mod x < 1/2.
    thanks bruh
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    Anyone else dreading this exam tomorrow? im feeling confident!! but i did for C3 then opened the paper haha
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    Guys how do you know which value to make u for substitution? I get confused.. or can you just use any of the two vlues e.g sin x cos^3 x
    I would have made cos^3 x to (cosx)^3 and then cosx= u but on the mark scheme they make sin x = u.
    Why?
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    How do you this is it a standard pattern type ? thank
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    (Original post by Phenylethanone)
    how do you know when to use the normal formula for volume of revolution OR the one whens it a parametric curve?
    usually u know it when they say it was turned 2pi or something like that most times they say the word revolution in the question
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    Kmttt keep makin these likkle errors like forgetting to put the minus sign and i drop a lot of marks


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    https://5a302d29ff432793ce79475dd3db...%20Edexcel.pdf
    how do you do question 2?
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    When doing integration by substitution, you know you have E.g. X=2u & you then find dx/du=2, from this point on do you have a way of knowing whether of not you:

    flip that to get dx/du=1/2 and then just write at the end of your integral: 1/2du as then the two du's cancel, or from dx/du=2 should multiply both sides by du to get dx=2du ?

    Hope that made sense

    I've always done it the first way but Im not sure if im right
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    (Original post by humayra.ac)
    How do you this is it a standard pattern type ? thank
    Yeah but i got stuck on this and asked my teacher and she said its not in the edexcel syllabus anymore so don't worry about it
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    (Original post by manlikem)
    Guys how do you know which value to make u for substitution? I get confused.. or can you just use any of the two vlues e.g sin x cos^3 x
    I would have made cos^3 x to (cosx)^3 and then cosx= u but on the mark scheme they make sin x = u.
    Why?
    I thought if you were to use substitution, it gave you the substitute?
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    oh really thanks

    (Original post by katie*may)
    Yeah but i got stuck on this and asked my teacher and she said its not in the edexcel syllabus anymore so don't worry about it
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    apply the a^x rule where if you differentiate a^X you get a^xlna



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    (Original post by Alice Moody)
    I thought if you were to use substitution, it gave you the substitute?
    what do you mean? The question is just integrate sinx cos^3 x dx
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    (Original post by humayra.ac)
    apply the a^x rule where if you differentiate a^X you get a^xlna
    that's what I was thinking but what you do with the 16? may you go through it
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    Does anyone know when you put the modulus bars wrapped around a function in- is it just when you integrate? And whether or not you can lose marks for putting in brackets instead?
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    (Original post by manlikem)
    what do you mean? The question is just integrate sinx cos^3 x dx
    oh....sorry thought the first bit was saying about using a substitute

    sorry
 
 
 
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