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    is this the same?

    xy=c^2
    dy/dx= -c^2x^-2

    and xy=c^2
    dy/dy= -y/x
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    (Original post by Acrux)
    is this the same?

    xy=c^2
    dy/dx= -c^2x^-2
    This is fine.



    and xy=c^2
    dy/dy= -y/x
    This is also fine if you meant dy/dx and not dy/dy.
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    (Original post by Zacken)
    This is fine.





    This is also fine if you meant dy/dx and not dy/dy.
    Yes i meant that.
    So either working is fine they both give same gradient
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    (Original post by Acrux)
    Yes i meant that.
    So either working is fine they both give same gradient
    Yeah.
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    (Original post by Zacken)
    Yeah.
    It might be as well to check the question as it may well say to give dy/dx in terms of x. In which case only one of your answers is fine.
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    (Original post by nerak99)
    It might be as well to check the question as it may well say to give dy/dx in terms of x. In which case only one of your answers is fine.
    It's most a question of "find the tangent to the parabola y = 4ax at P" in which case, either form doesn't matter.
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    Well I didn't see the OP quote the question or are you just guessing? It could be just a Core 4 implicit differentiation Q1i could it not?
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    what is this ****
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    (Original post by nerak99)
    Well I didn't see the OP quote the question or are you just guessing? It could be just a Core 4 implicit differentiation Q1i could it not?
    Possibly, but given that the OP asked about FP1 a few hours ago and this is pretty much the equation of a hyperbola, I highly doubt it. Plus I don't think they'd put something about a hyperbola in C4 since it's give those who do FP1 an unfair advantage.
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    Well Hyperbola is not on C4 as such but I think cross-referencing previous posts is, as the lawyers say, "too remote" ,to be a defence against overstating your certainty in your post earlier. <<< a very rare emoticon from me!
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    (Original post by nerak99)
    Well Hyperbola is not on C4 as such but I think cross-referencing previous posts is, as the lawyers say, "too remote" ,to be a defence against overstating your certainty in your post earlier. <<< a very rare emoticon from me!
    Correct.
    Tis FP1.
 
 
 
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