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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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