15. Let A = { -1, 0, 1, 2 }, B = {-4, -2, 0, 2} and 
be functions defined by 
and 
. Are f and g equal ? Justify your answer . (Hint: One may note that two functions 
and 
such that 
, are called equal functions).
be functions defined by and . Are f and g equal ? Justify your answer . (Hint: One may note that two functions and such that , are called equal functions).