The transfer functions for a cascade system are given as
G_(p_(1))=(7)/((2s+2)(3s+1)),G_(p_(2))=(2)/(4s+3),G_(l_(2))=(3)/(5s+3)
G_(C1) is a P controller, G_(C2)=2.1,G_(m1)=0.25,G_(m2)=0.3
Calculate the ultimate value of K_(p1) and offset for the primary controller for which a
cascade feedback loop goes into oscillation.