Difficult
$I_n = \int \frac{t^n}{1+t^2} dt, (n = 1, 2, 3, \ldots) \Rightarrow I_6 + I_4 =$
- A$\frac{1}{5} t^5 + c$
- B$\frac{1}{7} t^7 + c$
- C$\frac{1}{4} t^4 + c$
- D$\frac{1}{3} t^3 + c$
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