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{x″(t)=a1x(t)+b1y(t)+c1,y″(t)=a2x(t)+b2y(t)+c2} ✓ Mathematica : cpu = 13.5511 (sec), leaf count = 17774 Too large to display ✓ Maple : cpu = 0.256 (sec), leaf count = 457
{{x(t)=c1e−2a1+2b2−2a12−2a1b2+4a2b1+b22t2+c2e2a1+2b2−2a12−2a1b2+4a2b1+b22t2+c3e−2a1+2b2+2a12−2a1b2+4a2b1+b22t2+c4e2a1+2b2+2a12−2a1b2+4a2b1+b22t2+b1c2a1b2−a2b1−b2c1a1b2−a2b1,y(t)=−c1(a1b2−a2b1)(a1−b2+a12−2a1b2+4a2b1+b22)e−2a1+2b2−2a12−2a1b2+4a2b1+b22t2−c2(a1b2−a2b1)(a1−b2+a12−2a1b2+4a2b1+b22)e2a1+2b2−2a12−2a1b2+4a2b1+b22t2+c3(a1b2−a2b1)(−a1+b2+a12−2a1b2+4a2b1+b22)e−2a1+2b2+2a12−2a1b2+4a2b1+b22t2+c4(a1b2−a2b1)(−a1+b2+a12−2a1b2+4a2b1+b22)e2a1+2b2+2a12−2a1b2+4a2b1+b22t2−2(a1c2−a2c1)b12(a1b2−a2b1)b1}}
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