continuity involving signum function|Class12, IIT-JEE, Engineering Entrances|By R.M.Sir(IIT-KGP)

continuity involving signum function|Class12, IIT-JEE, Engineering Entrances|By R.M.Sir(IIT-KGP) It's essential for class 12, IIT-JEE, Engineering Entrances and all levels of Mathematics students when a signum function is continuous and where discontinuous