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典型的な常系数線形斉次方程式:特徴方程式:r^4+r^3+r+1=0r^3(r+1)+r+1=0(r+1)(r^3+1)=0(r+1)(r^2-r+1)=0r1=-1r2=-1r3=1/2+i根3/2r4=1/2-i根3/2通解:y=(c1x+c2)e^(-x)+{c3cos[(根3)x/2]+c4sin[(根3)x/2]}e^(...
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