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

$1 + \left( \frac{1}{2} + \frac{1}{3} \right) \frac{1}{4} + \left( \frac{1}{4} + \frac{1}{5} \right) \frac{1}{4^2} + \left( \frac{1}{6} + \frac{1}{7} \right) \frac{1}{4^3} + \dots \infty = $

જો $0 < x < 1$ અને $y = \frac{1}{2} x^{2} + \frac{2}{3} x^{3} + \frac{3}{4} x^{4} + \dots$ હોય,તો $x = \frac{1}{2}$ આગળ $e^{1+y}$ ની કિંમત શું થાય?

$\frac{1}{2 \cdot 3} + \frac{1}{4 \cdot 5} + \frac{1}{6 \cdot 7} + \frac{1}{8 \cdot 9} + \dots$ ની કિંમત શોધો.

$2 \ln x - \ln(x + 1) - \ln(x - 1)$ ના વિસ્તરણમાં,$x^{-4}$ નો સહગુણક શું છે?

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

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