IIT JEE mian maths class 12 differential calculus video solutions http://iitjeemaster.com/free-iit-jee-video-lecture-dvd/ India's Best Ever IIT JEE mains advanced preparation videos for Maths.
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This iit jee video lecture explains the problem of differentiation that was asked in iit jee 2013 paper.Differential calculus is the easier part of calculus as it fetches a direct question in IIT JEE entrance exam.