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The value of the definite integral, int1...

The value of the definite integral, `int_1^oo(e^(x+1) +e^(3-x))^-1dx` is

A

`(pi)/(4e^(2))`

B

`(pi)/(4e)`

C

`(pi)/(2e^(2))`

D

`(pi)/(2e)`

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