यदि $y = (\tan^{-1} x)^2$ है,तो $(x^2 + 1)^2 \frac{d^2 y}{dx^2} + 2x(x^2 + 1) \frac{dy}{dx} = $

  • A
    $4$
  • B
    $2$
  • C
    $1$
  • D
    $0$

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यदि $y = \left( \frac{ax + b}{cx + d} \right)^2$ है, तो $2 \frac{dy}{dx} \frac{d^3y}{dx^3}$ किसके बराबर है?

यदि $y=ax^{n+1}+b x^{-n}$ है,तो $x^2 \frac{d^2 y}{d x^2}=$

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