y'+(x^3+x^2-x+1)*y/(x^4-1)=(x+1)^2*e^-x * cosx /(2*y*(x^2+1))y'+(x^3+x^2-x+1)*y/(x^4-1)=(x+1)^2*e^-x * cosx /(2*y*(x^2+1))

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