Question: 8. (True/False) Two lines in threedimensional space parallel to a plane are parallel to one another. 9. (True/False) If ay) is a continuous function on

8. (True/False) Two lines in threedimensional space parallel to a plane are parallel to one another. 9. (True/False) If ay) is a continuous function on a closed, but unbounded set D, then f(3:,y) cannot achieve a local maximum on D. 10. (True/False) For any continuous function f (3:,y), we have fmy = fym

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