All solutions here are SUGGESTED. Mr. Teng will hold no liability for any errors. Comments are entirely personal opinions.

(i)

(ii) They are parallel to the y-axis.

Personal Comments:

This question is not tough, students just need to be cautious of adjusting the concavity at and . Since the value of d is not given, the concavity is quite debatable too, but one can be safe just to follow the given shape. For part (ii), some students gave really long answers and should learn to condense it to a simple “parallel to x or y axis”.

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