12th Mathematics Chapter Study Material English Medium 2021 By S Rajan M Sc M Phil M Ed -

Week 1: Calculus – Continuity and Differentiability. Rajan sir’s material broke the dreaded chain rule into a cooking recipe. “First, peel the outer function (the onion skin). Then, chop the inner function (the vegetable). Cook them together.” For the first time, derivatives made sense.

The night before the exam, Arjun didn't cram. He re-read the final page of S. Rajan’s material. It wasn't a revision formula. It was another letter. Week 1: Calculus – Continuity and Differentiability

It wasn't flashy. It had no “50 Sample Papers” or “Crash Course” stickers. Arjan almost put it back, but the price was just thirty rupees. He shrugged and bought it, more out of pity for the old bookseller than hope. Week 1: Calculus – Continuity and Differentiability