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  Q: Find the derivative f′(x) if f(x)=cos(x)+sin(x)
  A:
  f′(x) = cos(x)+sin(x)
  f′(x) = cos(x)+sin(x)
  f′(x) = cos(x)+sin(x)
  f′(x) = cos(x)+(cos(x)+sin(x))
  f′(x) = cos(x)+cos(x)
  f′(x) = cos(x)+cos(x)
  f′(x) = cos(x)
  f′(x) = cos(x)
  f′(x) = 1

  Q: Solve ln(x^2+ 1) = 5.
  A: x^2+1 = e^5.
  Q: Solve ln(x^3+ 1) = 5.
  A: x^3+1 = e^5.
  Q: Solve ln(x^4+ 1) = 5.
  A: x^4+1 = e^5.
  Q: Solve ln(x^5+ 1) = 5.
  A: x^5+1 = e^5.