Questions asked by Oliver S.

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• Answer to this double-angle formulae equation in trigonometry?
  
• Find a formula for Sn, the sum of the first n terms of the following geometric sequence. Help?
  
• Finding initial concentration by using Kc and equilibrium concentration?!
  
• Find the constant term in this binomial expansion?
  
• Expanding this binomial?
  
• Dilution of a diprotic acid?
  
• Using standard electrode potentials in a consistent manner?
  
• Russia in 1905?