Calculus is a tool used by engineers that determine the change of rate of any large quantities, specially tiny quantities areas.. and for calculating the small portion of a tiny thing, the importance of it can not be described in words... How ever I'm fond of mathematics!! That's why I'm enjoying this course so much !! and thanks to our honorable Protima Das mam for making this course interesting among the students!! Feeling very lucky for having this kind of course teacher..!