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CHAPTER AT A GLANCE
Introduction to Trigonometry
•Unit: Trigonometry
•Board weightage: Trigonometry (this chapter together with Some Applications of Trigonometry) carries about 12 marks out of 80; this chapter gives short questions on values and ratios and one proof of an identity (please check the latest sample paper)
•This textbook edition covers: trigonometric ratios of an acute angle, ratios of 0°, 30°, 45°, 60° and 90°, and the three identities. The ratios of complementary angles are not a separate topic in this edition.
•Most scoring part: values of ratios, evaluation of expressions, and proofs of identities
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