Do subscribe to Ekeeda Channel and press Bell icon to get updates about latest engineering HSC and IIT JEE main and advanced videos we will go through continuity of a function which are very close to the concept of limits The word continuous means without any break the concept of continuity in mass first introduced by great mathematician and scientist Sir Isaac Newton the Given function is continuous at a point it means if we draw the graph of that function from a given point without lifting pen or pencil from the plane of paper so in this chapter we will go through the continuity of different functions that is pregnant by trick functional then constant function modulus function algebraic function composite function exponential function etc now we see the definition of continuity of a function at a point so first of all we go through the right-hand limit limit X tends to a plus means X approaches to a you through a value greater than a you therefore right hand limit is equal to limit X tends to a plus FX that equal to limit X tends to a FX where X should be greater than a and that equal to limit H tends to 0 f of a plus h provided H should be greater than zero now we go through left-hand limit limit exchange – a – FX means X approaches to a you through a value less than II therefore the left-hand limit is equal to limit exchange to a minus FX that equal to limit exchange to a FX where X less than a and that equal to limit H tends to 0 F of a minus H where H should be greater than 0 so now just we see the right hand limit and left hand limit now here one thing we have to note that the right hand limit and less than limits are always not equal that is Libby exchange 2a minus FX and limit exchange 2a plus FX are always not equal and therefore limit exchange to a FX exists if and only if left hand limit is equal to right hand limit that is limit exchange to a minus F X should be equal to limit exchange to a plus FX that is left hand limit must be equal to right hand limit so this is all about the introduction of chapter continuity and continuity of a point thank you