4. Given a right triangle, with a right angle at the point B, if a = 9, b = 15, and c = 12, what are the primary trigonometric ratios for LA? 3 a. sin A = , cos A = , tan A = 4 4 3 , tan A = 4 b. sin A = - , COs A = C. sin A = 4. Cos A = 3 ,tan A = 3 COs A = 3 tan A = d. sin A = 4' +m +3

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