# which book teaching this kind of differential system for analysis

found starting from the following kind of differential system for a transfer function which book teaching how to analyze this kind of differential system

must design follow property a^2 + sqrt(1-a^2)^2 = 1 or det(A) = 0, or can it be further advanced?

which book teaching this kind of differential system?

http://www.maplesoft.com/support/help/Maple/view.aspx?path=DynamicSystems

Maple code
sys2 := DiffEquation([diff(x1(t), t) = a*x1(t)+a*u1(t), y1(t) = sqrt(1-a^2)*x1(t)+sqrt(1-a^2)*u1(t)], inputvariable = [u1(t)], outputvariable = [y1(t), x1(t)]);
sys2:-de;
k:=TransferFunction(sys2);
k:-tf;
expand(combine(k:-tf[1,1])) assuming a>0;

-