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Evaluate: int1^oo (e^(x+1)+e^(3-x))^(-1)...

Evaluate: `int_1^oo (e^(x+1)+e^(3-x))^(-1)dx`

A

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

B

`(pi)/(4e)`

C

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

D

`(pi)/(2e)`

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