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  1. M

    C4 today...Summer 2013

    yep correct
  2. M

    C4 today...Summer 2013

    yep i'm 100% sure its right, shame i didnt get it in the exam though as you want to find where a.b = 6 and those are the 2 points
  3. M

    C4 today...Summer 2013

    yeah i got the same for 7b its when the lower hald of dy/dx=0 so when dx/dy=0 8b i just realised after the exam, i think the answer was (7,2,4) and (-1,-6,8)
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