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i know that when function’s complement is open, then the function is closed and vice versa. but i donnt know to get that. i tried drawing it. but couldnt reach a result. i figured out its not convex. can someone please help me with this, if possible. how to approach such types. thanks :)

 i know that when function’s complement is open, then the function is closed and vice versa. but i donnt know to get that. i tried drawing it. but couldnt reach a result. i figured out its not convex.
 
can someone please help me with this, if possible.
how to approach such types. 
 
thanks :) 

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Grade:12th pass

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