1. y" + 3y + 2y = 2. 3. 4. 1 1 + ex y" + 3y + 2y = sin e* y" + y = sec Otan 9x y"-9y=3x 5. 4y" - y = xe/², y(0) = 1,y′(0) = 0 6. 2y"+y'-y = x + 1, y(0) = 1,y'(0) = 0

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