By doing this you can see that now try to use ok now if this this is zero, if you want this function to be continuous function, you want to be continuous function so ok positive side you take that is what is this right, this is a means you know only positive side this is zero.
இதைச் செய்வதன் மூலம், நீங்களே அதைக் பார்க்கலாம்.