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If a and b are arbitrary constants, then the solutions to the ordinary differential equation

                                                                $\frac{d^{2}y}{dx^2}$ – 4y = 0


  1. y = ax + b
  2. y = ae$^{-x}$
  3. y = asin2x + bcos2x
  4. y = acosh2x + bsinh2x
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