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y'=x-sinx y=x^2/2+cosx+C0y''=x-sinx y=x^3/6+sinx+C0X+C1y'''=x-sinx y=x^4/24-cosx+C0x^2/2+C1x+C2y^n=x-sinx通解y=x^(n+1)/(n+1)!+[(-1)^(n-1)+1]*(-1)^(n-1)cosx /2+[(-1)^n+1]*(-1)^nsinx /2 +C0x^(n-1)/(n-…
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