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  1. Y

    Maths P12 !!!!!!!

    For the question where it says prove a^2 <3b (if i remember). Why do you use b^2 - 4ac??? This is how i proceeded: disregarding part ii) of the question, The curve can either be increasing or decreasing , that is dy/dx is either greater or less than zero. Then i find dy/dx and then d^2...
  2. Y

    Math D O level exam Oct Nov 2011

    has anyone attempted the investment question the graph thing
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