Introduction to trigonometry

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chapter 8 Excercise 8. 4

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Introduction to trigonometry: 

Introduction to trigonometry CHAPTER – 8 EXERCISE – 8.4

QUESTION 3:-(i) sin2 63o + sin227o (i) sin 25o cos65o + cos25o sin 65o cos217o + cos273o: 

QUESTION 3:- (i) sin2 63o + sin227o (i) sin 25o cos65o + cos25o sin 65o cos217o + cos273o

QUESTION 5:-Prove the following identities, where the angles involved are acute angles for which the expressions are defined. (i) (cosec θ – cot θ)2 = 1 – cos θ 1 + cos θ: 

QUESTION 5:- Prove the following identities, where the angles involved are acute angles for which the expressions are defined. (i) (cosec θ – cot θ)2 = 1 – cos θ 1 + cos θ

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