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{d2dt2x(t)+x(t)+y(t)=−5,d2dt2y(t)−4x(t)−3y(t)=−3}
Mathematica: cpu = 0.103513 (sec), leaf count = 554 {{x(t)→−14c4e−t(e2tt+t−e2t+1)−12c1e−t(e2tt−t−e2t−1)−12c2e−t(e2tt+t−2e2t+2)−14c3e−t(e2t−1)t−18e−t(e−t(−13t−10)+et(10−13t))(e2tt+t−e2t+1)−18e−t(e2t−1)t(e−t(−13t−23)+et(13t−23))−18e−t(e2tt+t−2e2t+2)(et(13t−23)+e−t(13t+23))−18e−t(e2tt−t−e2t−1)(et(36−13t)+e−t(13t+36)),y(t)→c1e−t(e2t−1)t+12c4e−t(e2t+1)t+c2e−t(e2tt+t−e2t+1)+12c3e−t(e2tt−t+e2t+1)+14e−t(e2t+1)(e−t(−13t−10)+et(10−13t))t+14e−t(e2t−1)(et(36−13t)+e−t(13t+36))t+14e−t(e2tt−t+e2t+1)(e−t(−13t−23)+et(13t−23))+14e−t(e2tt+t−e2t+1)(et(13t−23)+e−t(13t+23))}}
Maple: cpu = 0.032 (sec), leaf count = 72 {{x(t)=18+_C1et+_C2e−t+_C3ett+_C4e−tt,y(t)=−2_C1et−2_C2e−t−2_C3ett−2_C3et−2_C4e−tt+2_C4e−t−23}}
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