NCERT NCERT Book PDF Class 11 Maths Chapter 3 Trigonometric Functions

Download the Class 11 Maths Chapter 3 Trigonometric Functions NCERT Book PDF, the official 2026-27 NCERT textbook chapter. It extends trigonometry from triangles to functions of any angle, and its identities feed straight into calculus and coordinate geometry tested in the Boards, JEE Main, JEE Advanced and CUET.

• Official NCERT 2026-27 chapter, clean and print-ready.
• Covers radian measure, trigonometric functions and sum-difference identities.
• Read it alongside the solved exercises and the formula sheet linked below.

This Class 11 Maths Chapter 3 Trigonometric Functions NCERT Book PDF is the official 2026-27 NCERT text, checked page by page against the latest edition.

What Class 11 Maths Chapter 3 Trigonometric Functions Covers

The chapter begins with the measurement of angles in degrees and radians, defines the six trigonometric functions on the unit circle, and then derives the identities for sums and differences of angles. The official NCERT sections are listed below.

Key Concepts You Will Study

Students should read the chapter with a pen and note each identity as it appears. The formulas are many, but they follow from a few base results.

• The link between degree and radian measure and the arc-length relation l = rθ.
• The six trigonometric functions defined on the unit circle and their signs.
• The domain, range and period of sin, cos, tan and their graphs.
• Sum and difference identities for sin(x ± y) and cos(x ± y).
• Double, triple and product-to-sum formulas built from them.

Why Download the NCERT Book PDF for This Chapter

The NCERT textbook is the single most important source for the CBSE exam, and most JEE and CUET questions from this chapter are built directly on its identities and examples.

• Every Board question on identities and equations comes from this text or its exercises.
• The worked examples show the correct order of applying the identities.
• Reading offline from the PDF avoids missing any small sign or condition.

How to Use the NCERT Book PDF for Trigonometric Functions

Read the chapter once fully, then work through it a second time with the exercises open. A short, ordered plan keeps the many identities from blurring together.

• Read each section, then write its identity in your own words in a single line.
• Learn the unit-circle signs before you memorise any formula.
• Solve the in-text examples before looking at the given solution.
• Attempt the back exercises, then check them against the NCERT Solutions below.

Other Class 11 Maths Trigonometric Functions Resources

Pair the textbook PDF with the solved answers, revision notes and formula sheet for the same chapter.

FAQs on Class 11 Maths Chapter 3 NCERT Book PDF