Find all points (if any) of horizontal and vertical tangency to the curve. Use a graphing utility to confirm your results. (If an answer does not exist, enter DNE.) x = t2 - t + 9, y = 3 - 3t Horizontal tangents (x, y) = (9, -2 smaller x-value (x, y) = 11,2 larger x-value Vertical tangent 11 (x, y) =

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