Answers created by Michael G.

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• What is `int ln(x^2+4)dx`?
  
• How do you integrate `int x^2/sqrt(4x^2+25)dx` using trigonometric substitution?
  
• How do you integrate `int e^x/(7+e^(2x))` by trigonometric substitution?
  
• How do capacitors store energy?
  
• How to differentiate?
  
• How do you solve `4c^2 + 10c = -7` by completing the square?