The value of the definite integral int(-...

The value of the definite integral `int_(-oo)^( a)((sin^(-1)e^(x)+sec^(-1)e^(-x))dx)/((tan^(-1)e^(a)+tan^(-1)e^(x))(e^(x)+e^(-x)))(a<0)` is
(A) Independent of `a,` (B) dependent on `a,` (C) `(pi)/(2)ln2,` (D) `(pi)/(2)ln(2tan^(-1)e^(a))`

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