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Let In=int tan^n x dx, (n>1). If I4+I6...

Let `I_n=int tan^n x dx, (n>1)`. If `I_4+I_6=a tan^5 x + bx^5 + C`, Where `C` is a constant of integration, then the ordered pair `(a,b)` is equal to :

A

`(1/5,-1)`

B

`(-1/5,0)`

C

`(-1/5,1)`

D

`(1/5,0)`

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