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Question

If A={(x,y):y=ex,x belongs to R} and B={(x,y):y=e-x,x belongs to R}, then write A intersection B.

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Solution

y=ex here x can vary from - infinity to + infinity but y can be only positive number
so A = {R,positive number}
and for y =e-x x can vary from - infinity to + infinity but y can be only positive number
so B ={R,positive number}
so A intersection B is ={ R,positive number}

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