Introduction to trigonometry

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Introduction to trigonometry: 

Introduction to trigonometry CHAPTER – 8 EXERCISE – 8.4

QUESTION 5:-(iv) 1 + sec A = sin2 A sec A 1 – cos A: 

QUESTION 5:- (iv) 1 + sec A = sin2 A sec A 1 – cos A

cos A – sin A + 1 = cosec A + cot Acos A + sin A - 1 using the identity cosec2 A = 1 + cot2A: 

cos A – sin A + 1 = cosec A + cot A cos A + sin A - 1 using the identity cosec2 A = 1 + cot2A

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