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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):x^(2)+y^(2) le 2, x ,y in R}`
`B={{x,y): y gex^(2),x,y in R}`
Then domain of `A cap B` is

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