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If I(n)=int(0)^(pi//4) tan^(n)theta d th...

If `I_(n)=int_(0)^(pi//4) tan^(n)theta d theta ` for `1,2,3,…` then
`I_(n-1)+I_(n+1)=`

A

0

B

1

C

`1//n`

D

`1//n+1`

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