Q 2553334244.     The value of the integral `int(dx)/(e^x+e^(-x))^2` is

WBJEE 2010
A

`1/2(e^(2x) +1)+c`

B

`1/2(e^(-2x)+1)+c`

C

`-1/2(e^(2x)+1)^(-1)+c`

D

`1/4(e^(2x)-1)+c`

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