Questions asked by Zainab B.

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• How do you verify #(2cos^2x-1)^2/(cos^4x-sin^4x)#?
  
• How do you verify #(2cos^2x-1)^2/(cos^4x-sin^4x)=1-2sin^2x#?
  
• How do you verify #(1+sinx+cosx)/(1+sinx-cosx)=(1+cosx)/sinx#?
  
• How do I do this chemistry quick lab on limiting reactants?