gistfile1.txt

syms Ka;
syms s;
syms K1;
syms R;
syms T;




G = 9/(s^2 + 2*0.2*3*s + 9);
G = simplify(expand(G));
Gc = simplify(expand(Ka * G));

H = simplify(expand((Gc)/(1 + K1*Gc)));

S_HKa = simplify(expand(diff(log(H), Ka, 1)*Ka));
S_HK1 = simplify(expand(diff(log(H), K1, 1)*K1));
pretty(S_HKa)
pretty(S_HK1)



Y =simplify(expand(R * H + T / Ka * H));
pretty(Y)