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y″(x)=−y(x)(a(x4+1)+bx2)x4−y′(x)x ✓ Mathematica : cpu = 0.36644 (sec), leaf count = 34
{{y(x)→c1MathieuC[−b,a,ilog(x)]+c2MathieuS[−b,a,ilog(x)]}} ✓ Maple : cpu = 2.386 (sec), leaf count = 73
{y(x)=HeunD(0,2a+b,0,2a−b,x2+1x2−1)(∫1x(HeunD(0,2a+b,0,2a−b,x2+1x2−1))−2dx_C2+_C1)}
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