(4) A sequential circuit has two JK flip-flops A and B and one input x. The circuit is described by the following flip-flop input equations: JA=x' KA=B' JB=x' K3 = A (a) Derive the state equations A(t + 1) and B(t+1) by substituting the input equations for the J and K variables. (b) Draw the state diagram of the circuit