$\log_e \left( 1 + ax^2 + a^2 + \frac{a}{x^2} \right)$ નું મૂલ્ય શું છે?

  • A
    $a \left( x^2 - \frac{1}{x^2} \right) - \frac{a^2}{2} \left( x^4 - \frac{1}{x^4} \right) + \frac{a^3}{3} \left( x^6 - \frac{1}{x^6} \right) - \dots$
  • B
    $a \left( x^2 + \frac{1}{x^2} \right) - \frac{a^2}{2} \left( x^4 + \frac{1}{x^4} \right) + \frac{a^3}{3} \left( x^6 + \frac{1}{x^6} \right) - \dots$
  • C
    $a \left( x^2 + \frac{1}{x^2} \right) + \frac{a^2}{2} \left( x^4 + \frac{1}{x^4} \right) + \frac{a^3}{3} \left( x^6 + \frac{1}{x^6} \right) + \dots$
  • D
    $a \left( x^2 - \frac{1}{x^2} \right) + \frac{a^2}{2} \left( x^4 - \frac{1}{x^4} \right) + \frac{a^3}{3} \left( x^6 - \frac{1}{x^6} \right) + \dots$

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$\log_{10}\left(\frac{n}{n-1}\right)$ ના વિસ્તરણમાં $n^{-r}$ નો સહગુણક શું છે?

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