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In some question of sets, we have to mak...

In some question of sets, we have to make the use of graphs
For example
`A={(x,y):y=e^(x), x in R}`
`B={{x,y}: y=-x. x in R}`
Find `n(A cap B)`

It is clear that `y=e^(x) and y=-x` intersect at one pont. Hence `n(A cap B)=1`
`A:{(x,y):y=sqrt(4-x^(2)), x in [-2,2]}`
`B={(x,y):y=|x|, x in R}`
Then `n(A cap B)`

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