This chapter introduces the concept of trigonometric identities, which are equations that hold true for all permissible values of the angles involved. Students will understand and apply reciprocal identities and Pythagorean identities to simplify trigonometric expressions.

The chapter also focuses on proving Pythagorean identities step by step and using them to solve numerical problems. Mastery of these identities improves algebraic manipulation skills and plays a crucial role in achieving accuracy and confidence in the CBSE Board examinations.