$I_n = \int \frac{t^n}{1+t^2} dt, (n = 1, 2, 3, \ldots) \Rightarrow I_6 + I_4 =$

  • 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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$\int \frac{dx}{\tan x+\cot x+\sec x+\operatorname{cosec} x} = $

વિધાન $(A)$: જો $I_n = \int \cot^n x \, dx$ હોય,તો $I_6 + I_4 = \frac{-\cot^5 x}{5}$ થાય.
કારણ $(R)$: $\int \cot^n x \, dx = \frac{-\cot^{n-1} x}{n-1} - \int \cot^{n-2} x \, dx$.

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$\int \sqrt{x-1}(x \sqrt{x+1})^{-1} d x=$

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