niech a={(x,y) : y<x} B={(x,y) : y/x<1} zaznaczyc na płaszczyźnie zbiory A\B B\A
A = {(x,y): y < x}
B = {(x,y): y/x < 1}
y/x < 1
x < 0 => y > x
x > 0 => y < x
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A = {(x,y): y < x}
B = {(x,y): y/x < 1}
y/x < 1
x < 0 => y > x
x > 0 => y < x