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Let f(x)=(e^(x)+1)/(e^(x)-1) and int(0)^...

Let `f(x)=(e^(x)+1)/(e^(x)-1) and int_(0)^(1) x^(3) .(e^(x)+1)/(e^(x)-1) dx= alpha "Then" , int_(-1)^(1) t^(3) f(t) dt` is equal to

A

`0`

B

`alpha`

C

`2alpha`

D

`alpha^(2)`

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