In Problems 21-28, use the procedure illustrated in Problem 20 to find at least the first four nonzero terms in a power series expansion about x = 0 of a general solution to the given differential equation. 21. y' xy sin a = 22. w' + xwe 23. 2" + x2 + 2 = x² + 2x + 1 24. y" - 2xy' + 3y = x² 25. (1+x²)y" - xy' +y=e=² 26. y" xy' + 2y = cos x 27. (1-x²)y" - y' + y = tan x

Q: 3 + 9 m=0' 2"

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Q: Answer number 2

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