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As another option, you can extract the values of A3 and A4 through the subs method:

sage: sol_A3 = A3.subs(solutions)
sage: sol_A4 = A4.subs(solutions)
sage: sol_A3
1/2*(2*K*l - (K^2*l^2 + 2)*sin(K*l))*qzc/(K^5*l*cos(K*l) - K^4*sin(K*l))
sage: sol_A4
1/2*((K^2*l^2 + 2)*cos(K*l) - 2)*qzc/(K^5*l*cos(K*l) - K^4*sin(K*l))

This also works if the solutions are given as a dictionary.