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In=int0^(pi//4) tan^n x\ dx, then lim(nt...

`I_n=int_0^(pi//4) tan^n x\ dx`, then `lim_(ntooo) n\ [I_n + I_(n+2)]` is equal to (i)`1/2` (ii)`1` (iii)`infty` (iv) `0`

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