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Jan 17th, 2018
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  1. DSolve[y''[t] == Sqrt[1 + y[t]^2], y[t], t]
  2.  
  3. DSolve[{y''[t] == Sqrt[1+y[t]^2, y[0] == 0}, y[t], t]
  4.  
  5. DSolve[y''[t] == Sqrt[1 + y'[t]^2], y[t], t]
  6. (*{y[t] -> C[2] + Cosh[t] Cosh[C[1]] + Sinh[t] Sinh[C[1]]} *)
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