, which allow complex functions to be represented as infinite polynomials. Partial Differentiation:

A PDF is just a file. It is inert. The true value of Das Gupta lies not in the format of the book, but in the sweat and time you invest in solving every difficult limit and derivative within its pages. Whether on paper or a screen, the condition of your notebook—filled with crossed-out attempts and triumphant solutions—is the only thing that will raise your JEE rank.

If you have only 6 months for JEE prep, choose Das Gupta over Maron. If you have 2 years, do Das Gupta followed by Maron.

Dedicated chapters on tangents, normals, curvature, and asymptotes.