જો $\int \frac{5 \tan x}{\tan x-2} dx=ax+b \log |\sin x-2 \cos x|+c$ હોય,તો $a+b=$

  • A
    $2$
  • B
    $3$
  • C
    $4$
  • D
    $-1$

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જો $I_n = \int \frac{1}{(x^2+1)^n} dx$ હોય, તો $2n I_{n+1} - (2n-1) I_n = $

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