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5. Iins in the interval (% , n), and r is in the interval (0, g) , given that StnX =2 1 and COSY =

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5. Iins in the interval (% , n), and r is in the interval (0, g) , given that StnX =2 1 and COSY = E , evaluate: a. Sin(XY) (2} b. COS(2X} (2} 1:. Determine the quadrant of the angle 2X (Show your work} (3}

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