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Introduction to trigonometry:Introduction to trigonometry CHAPTER – 8
EXERCISE – 8.4
QUESTION 5:-(vi) 1 + sin A = sec A + tan A 1 – sin A:QUESTION 5:- (vi) 1 + sin A = sec A + tan A 1 – sin A
sin θ – 2 sin3 θ = tan θ2 cos3 θ – cos θ:sin θ – 2 sin3 θ = tan θ 2 cos3 θ – cos θ
(viii) (sin A + cosec A)2 + (cos A + sec A)2 = 7 + tan2A + cot2A:(viii) (sin A + cosec A)2 + (cos A + sec A)2 = 7 + tan2A + cot2A
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