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  1. I

    Stuck on an example. MIF 3.08 Example 26

    Thankyou :)
  2. I

    Stuck on an example. MIF 3.08 Example 26

    How/why do we get the line in the red box?
  3. I

    Cambridge 4I Q17 a) and c)

    My brain is fried. Uh. such a silly thing to get stuck on. Literally 2u stuff
  4. I

    Cambridge 4I Q17 a) and c)

    Why does du = (1+t^-2) dt
  5. I

    Cambridge 4I Q17 a) and c)

    The enrichment questions always make me feel inadequate. I can't figure out part a). b) is done 👍 .
  7. I

    Cambridge 4D Q15

    Perfect. Thankyou very much! It's all clear now
  8. I

    Cambridge 4D Q15

    Maybe I'm missing something simple... "In the notation of the text". What does this mean?
  9. I

    Differentiation

    Ok, awesome! I'll keep this in mind, and will look forward to learning multivariable calculus in the future :) Thanks very much
  10. I

    Cambridge 4D Q15

    Struggling to see it unfortunately. I feel like I'm close, but just need someone to spell it out for me
  11. I

    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 question above? (I know you can't solve the question using this statement. I just want to know if the statement is true)
  13. I

    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 cone without changing the height of it. So the rates at which they are changing are independent are they not? Pls help me understand
  14. I

    Differentiation

    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 , it also gives a different wrong answer. Why are these methods wrong?
  15. I

    Cambrdige 4I Q15

    Oh thanks mate. Easy logic.
  16. I

    Cambrdige 4I Q15

    For Q15 e) . Part of the solution uses the fact that I>0 for all n (highlighted in green). How do we know this?
  17. I

    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
  19. I

    Cambridge 4D Q15

    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 and I want to look into it.
  20. I

    2023 HSC Q13.a)

    thkyou!
  21. I

    2023 HSC Q13.a)

    I can find the solution if I use the method in the marking guidelines. However, why doesn't my method give the correct answer? i. is good. ii. is good. iii. is wrong.
  22. I

    perms and combs q

    a) There are 4 spaces: _ _ _ _ You must put M in one of the four spaces = 4 possible ways. The remaining three spaces may be filled by: D,O,E,S,T,I = 6*5*4 = 120 possible ways. 4*120 = 480 possible ways. Think of it as: there are 120 possible ways to choose 3 different letters from D,O,E,S,T,I...
  23. I

    Volume of Rotation Question. (Cambridge Ext 1, 12F Q20. )

    Righto. Seems like I'm clear then. I actually drew the region the same as your at first; but then, that region I posted above was taken directly out of the official Cambridge Worked Solutions as the answer to Q20 b) and I became confused. Good to know I'm not missing any "big ideas". Thanks...
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