यदि $4\left[ {{x^2} + \frac{{{x^6}}}{3} + \frac{{{x^{10}}}}{5} + \dots} \right] = {y^2} + \frac{{{y^4}}}{2} + \frac{{{y^6}}}{3} + \dots$ है,तो

  • A
    ${x^2}y = 2x - y$
  • B
    ${x^2}y = 2x + y$
  • C
    $x = 2{y^2} - 1$
  • D
    ${x^2}y = 2x + {y^2}$

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यदि $P = 1 + \frac{1}{2 \times 2} + \frac{1}{3 \times 2^{2}} + \dots$ और $Q = \frac{1}{1 \times 2} + \frac{1}{3 \times 4} + \frac{1}{5 \times 6} + \dots$ है, तो

यदि $y = 2x^2 - 1$ है,तो $\left[ \frac{1}{y} + \frac{1}{3y^3} + \frac{1}{5y^5} + \dots \right]$ का मान क्या होगा?

$\log_e \left( 1 + ax^2 + a^2 + \frac{a}{x^2} \right)$ का मान क्या है?

$\log_e(1 + 3x + 2x^2)$ के विस्तार में $x^n$ का गुणांक क्या है?

$\frac{1}{1 \cdot 2} - \frac{1}{2 \cdot 3} + \frac{1}{3 \cdot 4} - \frac{1}{4 \cdot 5} + \dots \infty = $

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