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  1. A

    help

    sulphuric acid dehydrates the ethanol and NaOH is used to purify by raecting with any sulphuric acid left
  2. A

    chemistry>>p4>>application>> biochem

    u shud study it it could come
  3. A

    MATHS P3 HELP!

    thats damn hard
  4. A

    MATHS P3 HELP!

    were do u get it from
  5. A

    chemistry>>p4>>application>> biochem

    you can get asked anything on that booklet
  6. A

    mcq 22

    subject please
  7. A

    MATHS P3 HELP!

    i dunno ive done all da past papers nothin like that
  8. A

    MATHS P3 HELP!

    well it would me much better if u could give the whole question quoted from wer u got it. cause that clearly makes no sense."find da other line" WTF does that mean just sayin
  9. A

    MATHS P3 HELP!

    i know another way but is realy long, there are a lot of other ways but i dont know them as for the fixed point ill give a simple way. put z as 0 in both equations, or x or y anyone (just make one variable zero) now u have 2 equations from 2 variables.solve simultaneously and get x and y say x...
  10. A

    MATHS P3 HELP!

    u must only get the same direction vector. the fixed point in the equation can be a lot of things. i have a very easy way.if u have the cambridge book it should show u how to find a common perpendicular. use the equatin of the normal for each plane and find their common perpendicular wich is...
  11. A

    helpful sites for physics revision (notes)

    no big deal. i took my a level in november, and i didnt even go to skl for the past year and took no private tutoring. with the help of books and internet including XPF i managed to get an A. u should learn to self study from now cause in university there aint much help.
  12. A

    Maths--functions..

    im takin A-level math only already took chemistry and physics in november it gets boring when there isnt much to study
  13. A

    Maths--functions..

    yea thats why i said in my first reply that u must of forgotten the squared sign
  14. A

    Maths--functions..

    2-5cos^2(X) you may have not noticed the squared and took x=pi that would give u a value of -3(minimum) any value cos^2(x) would be positive and would be subtracted from the two so to find the greatest value u musnt subtract any thing 2-0 is 2 u must have forgotten about the square
  15. A

    2011 june practicals

    wat do u mean some people think its cheating, the fact is it is cheating. Cambridge set the rules, going against them is cheating
  16. A

    2011 june practicals

    i understand, but there is no occasion where cheating will help, so its best to rely on yourself. and if u study good enuf u could get just as good as the other people who cheated
  17. A

    OCT/NOV 2009 Paper 12

    wat subject?
  18. A

    derivative.......

    so how do u know all these things that arnt in our syllabus
  19. A

    derivative.......

    we all assumed that way cause its in our syllabus,wheras the other way isnt. usman wat syllabus are u studying cause in a lot of other threads questions outside the syllabus where asked an u could anser all?
  20. A

    derivative.......

    nibz was close after the log rule u must diffrentiate using the product rule not just cos(X).(1/x)
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