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Let b be a positive constant. Let two cu...

Let `b` be a positive constant. Let two curves `S_(1):e^(-x)y=1` and `S_(2):e^(x)y=e^(b)` . Let `A` be the area of the part surrounding by `S_(1),S_(2)` and `x=0` ,then `lim_(b rarr0)(3A)/(4b^(2))` is equal to

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