IF xr =cos pi /2r+ i sin pi/2r,then value of x1.x.2x3...to infinity isequal to1.12.03. -14.2 Share with your friends Share 8 Ajanta Trivedi answered this given: xr=cosπ2r+i.sinπ2r=ei.π2rthereforex1.x2.x3............=ei.π2.ei.π22.ei.π23...............upto infinity=ei.π.12+122+123+..........upto infinity=ei.π.1/21-12=ei.π=cosπ+isinπ=-1 thus option (3) is correct. hope this helps you 21 View Full Answer