ISAM77's latest activity

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    ISAM77 replied to the thread Cambridge 4I Q17 a) and c).
    My brain is fried. Uh. such a silly thing to get stuck on. Literally 2u stuff
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    ISAM77 replied to the thread Cambridge 4I Q17 a) and c).
    Why does du = (1+t^-2) dt
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    ISAM77 posted the thread Cambridge 4I Q17 a) and c) in Mathematics Extension 2.
    The enrichment questions always make me feel inadequate. I can't figure out part a). b) is done 👍 .
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    ISAM77 replied to the thread Cambridge 4D Q15.
    Perfect. Thankyou very much! It's all clear now
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    ISAM77 replied to the thread Cambridge 4D Q15.
    Maybe I'm missing something simple... "In the notation of the text". What does this mean?
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    ISAM77 replied to the thread Differentiation.
    Ok, awesome! I'll keep this in mind, and will look forward to learning multivariable calculus in the future :) Thanks very much
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    ISAM77 replied to the thread Cambridge 4D Q15.
    Struggling to see it unfortunately. I feel like I'm close, but just need someone to spell it out for me
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    ISAM77 replied to the thread Differentiation.
    Ok 👍 So what you're saying is, in this circumstance, dV/dt =/= dV/dr * dr/dt . Is that correct? Would this statement be true for the...
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    ISAM77 replied to the thread Differentiation.
    I get that they're both changing over time. But why does that make them dependent on each other? e.g. you can increase the radius of a...
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    ISAM77 posted the thread Differentiation in Mathematics Extension 1.
    Just doing some practice on Khan Academy. I'm just wondering why the working out on the right is wrong. If I use dV/dt = dV/dh * dh/dt...
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    ISAM77 replied to the thread Cambrdige 4I Q15.
    Oh thanks mate. Easy logic.
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    ISAM77 posted the thread Cambrdige 4I Q15 in Mathematics Extension 2.
    For Q15 e) . Part of the solution uses the fact that I>0 for all n (highlighted in green). How do we know this?
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    ISAM77 replied to the thread Cambridge 4D Q15.
    I'll have another look at it later to try and understand what's going on. I'll let you know how I go
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    ISAM77 posted the thread Cambridge 4D Q15 in Mathematics Extension 2.
    Is there a special name for this technique? I was able to find a solution for a). But I'm not sure how to use this to solve integrals...
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