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8. y'=-2y+(e^x)-1, y(0)=11/6
10. y''-y=0, y(0)=2, y'(0)=4
11. y''-2y'+y=0, y(0)=4, y'(0)=11
12. y''+y=0, y(0)=3, y'(0)=2
13. y''-y=x, y(0)=7, y'(0)=2
14. y''-y=e^x, y(0)=3, y'(0)=1
15. y''-2y'+y=e^x, y(0)=5, y'(0)=7