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D= {-2, -1, 0 ,1, 2}
ZW={0, 2, 6}
b)
D= {-2, -1, 1, 2 }
ZW={}
f(-2)=(-2)^2-2=4-2=2
f(-1)=(-1)^2-1=1-1=0
f(0)=0^2+0=0+0=0
f(1)=1^2+1=1+1=2
f(2)=2^2+2=4+2=6
ZW={0,2,6}
b)
f(-2)=-1/2
f(-1)=1/-1=-1
f(1)=1/1=1
f(2)=1/2
ZW={-1,-1/2,1/2,1}