Questions asked by Alicia

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• How to find the equation for a tangent to a circle with only one point?
  
• 4/(x^2) not as a fraction?
  
• Derive elastic strain energy?
  
• How to integrate ((e^x)-e^(-x)) between 1 and 0?
  
• How to solve #2e^x -1 = 21e^(-x)#?
  
• How to solve #3sin(x+10)=cos(x-20)#?