જો $0 < a, b < 1$ અને $\tan^{-1} a + \tan^{-1} b = \frac{\pi}{4}$ હોય,તો $(a+b) - \left(\frac{a^2+b^2}{2}\right) + \left(\frac{a^3+b^3}{3}\right) - \left(\frac{a^4+b^4}{4}\right) + \dots$ ની કિંમત ..... છે.

  • A
    $\log_e 2$
  • B
    $e^2 - 1$
  • C
    $e$
  • D
    $\log_e \left(\frac{e}{2}\right)$

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Similar Questions

$\frac{1}{2}x^2 + \frac{2}{3}x^3 + \frac{3}{4}x^4 + \dots \infty = $

$\frac{1}{5} + \frac{1}{2} \cdot \frac{1}{5^2} + \frac{1}{3} \cdot \frac{1}{5^3} + \dots \infty = $

જો $y = 2x^2 - 1$ હોય,તો $\left[ \frac{1}{y} + \frac{1}{3y^3} + \frac{1}{5y^5} + \dots \right]$ ની કિંમત શું થાય?

$\frac{1}{2} - \frac{1}{2 \cdot 2^2} + \frac{1}{3 \cdot 2^3} - \frac{1}{4 \cdot 2^4} + \ldots$ ની કિંમત શોધો.

$1 + \frac{(\log_e n)^2}{2!} + \frac{(\log_e n)^4}{4!} + \dots = $

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