જો $\int \frac{7 x^8+8 x^7}{\left(1+x+x^8\right)^2} d x=f(x)+c$ હોય, તો $f(x)$ ની કિંમત શોધો.

  • A
    $\frac{x^8}{1+x+x^8}$
  • B
    $28 \log \left(1+x+x^8\right)$
  • C
    $\frac{1}{1+x+x^8}$
  • D
    $\frac{-1}{1+x+x^8}$

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જો $\int {\frac{{\cos 4x + 1}}{{\cot x - \tan x}}} dx = k\,\cos 4x + c$ હોય,તો:

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