kevin

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Recent Names

  • kevin
  • paul
  • :) 3====================D
  • hayati lelah
  • Dimitri
  • Bareta
  • d(ln x)/dx = 1/x
  • cosh x = (e^x + e^-x)/2
  • sinh x = (e^x - e^-x)/2
  • d(a^x)/dx = a^x .ln a

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