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  1. R

    future of dry cells and button cells

    does anyone have ideas or information on future directions of dry cells and button cells? personal opinions welcome :)
  2. R

    medical physics help

    does anyone have any info on when PET scanning was developed?
  3. R

    urgent maths help needed!

    f(x)=(sinx)/x , find f'(x) and hence show f(x) is monotomic decreasing between 0 and pi/2 wat do u do after finding 1st derivative??
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