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If sin x = - - and tany = where a and y are in the interval [7 /2, 37 /2], What are the exact values of the following trigonometric ratios? (Matching problem) Answer: - cos (2 x - 2 y) - cos (2 x) -- cos (2 y) tan (x + y ) - sin (2 x) -- cos (z) - cos (y) - sin (y) -- tan (2) sin (2 y) 5+2 48 5V48-2 987+40148 1,421 + 29 6