If I(n)=overset(pi//4)underset(0)int tan...

If `I_(n)=overset(pi//4)underset(0)int tan ^(n) x dx, lim_(n to oo) n(I_(n+1)+I_(n-1))` equals

A

`(1)/(2)`

B

1

C

`oo`

D

zero

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The correct Answer is:

B

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