Express all trigonometric ratios in terms of cos A
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sin^2 A= 1-cos^2A
tan A =(1- cos^2 A)^1\2 \cos A
secA= 1\cos A
cosecA =1\(1-cos^2A)^1\2
cotA= cosA \(1-cos^2A)^1\2
tan A =(1- cos^2 A)^1\2 \cos A
secA= 1\cos A
cosecA =1\(1-cos^2A)^1\2
cotA= cosA \(1-cos^2A)^1\2
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