12th Mathematics Chapter Study Material English Medium 2021 By S Rajan M Sc M Phil M Ed |best| May 2026

Unit V: Continuity and Differentiability

• Topics: Continuity at a point, differentiability, chain rule, parametric differentiation.
• S Rajan’s Unique Approach: “Left-hand derivative ≠ Right-hand derivative” illustrated with actual graph sketches (hand-drawn style). Useful for visual learners.

“I failed in half-yearly maths. After following S. Rajan’s material for 2 months, I scored 82 in boards. The common error boxes saved me from silly mistakes.”
— Priya S., CBSE 2022 The 12th Mathematics study material by S

This material focuses on the most critical chapters for the board exams, providing key formulas, concept summaries, and solved examples. “I failed in half-yearly maths

Chapter-wise Solutions: Detailed step-by-step answers for textbook exercises. providing key formulas

• Reduced syllabus due to COVID-19 pandemic.
• Increased weightage on application-based problems.
• Step-marking schemes for board exams.

If you can get your hands on a genuine copy (PDF or print), pair it with disciplined practice. Don’t just read the solved examples – close the book and solve them again. As S Rajan writes in the foreword: