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-(x + 1)*e^(-x) + ((x + 1)*e^(-x) - e^(-x))*x + 1
Syntax Error:
solve([k12*c2+k13*c3==b1,(k22-lambda)*c2+ k23*c3==b2],c2,c3)
[[c2 == (9/4), c3 == (1/4)]]
Syntax Error:
k12=1;k13=3;b1=4;k22=5;k23=-2;b2=5;