यदि $z = \frac{(x^4 + y^4)^{1/3}}{(x^3 + y^3)^{1/4}}$ है,तो $x\frac{\partial z}{\partial x} + y\frac{\partial z}{\partial y} = $

  • A
    $\frac{1}{12}z$
  • B
    $\frac{1}{4}z$
  • C
    $\frac{1}{3}z$
  • D
    $\frac{7}{12}z$

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यदि $u = (x^2 + y^2 + z^2)^{3/2}$ है,तो $\left( \frac{\partial u}{\partial x} \right)^2 + \left( \frac{\partial u}{\partial y} \right)^2 + \left( \frac{\partial u}{\partial z} \right)^2 = $

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