`int(5(x^6+1))/(x^2+1)` dx=

A

(A) `5(x^7 + x) tan^-1 x + c`

B

(B) `x^5-5/3x^3+5x+c`

C

(C) `3x^4-5x^2+15x + c`

D

(D) `5 tan^-1 (x^2 + 1) + log(x^2 + 1) + c`

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