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Unformatted text preview: 3 4 2sin y y y t ′′ ′= 6. Solve the differential equation by variation of parameters. 9 9 x x y y e ′′ = Formula: 2 1 1 2 y f u W y f u W ′ =  ′ = 7. Solve the CauchyEuler Equations. a. 2 2 x y xy y ′′ ′ + + = b. 2 5 4 x y xy y ′′ ′ + + = 8. A force of 400 Newton’s stretches a spring 2 m. A mass of 50 kg is attached to the end of the spring and released from equilibrium position with an upward velocity of 10 m s . Find the equation of motion and ivp’s (DO NOT SOLVE)...
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 Spring '11
 Leon
 Differential Equations, Equations, Derivative, dx

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