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3.1.2
Linear ode with non-constant coefficients
3.1.2.1
Euler type \(x^{3}y^{\prime \prime \prime }+x^{2}y^{\prime \prime }+xy^{\prime }+y=f\left ( x\right ) \)
3.1.2.2
Missing \(y\) as in \(ay^{\prime \prime \prime }+by^{\prime \prime }+cy^{\prime }=f\left ( x\right ) \)
3.1.2.3
Solved by series method
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