d²y ii. dx² 3. Determine whether the given function is a solution to the given differential equation. x" x 0, with possible solution x(t) = 2 cost - 3 sin t i. +y=x²+x+1, with possible solution y(x) = sin x+x²+x+1 d20 de iii. dt² dt +30=-2e2t, with possible solution (t) = 2e3t-e2t iv. y" +4y-5ex, with possible solution y(x) = 3 sin 2x - e-x

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