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 $u = \tan^{-1}(\frac{y}{x})$ है,तो यूलर प्रमेय के अनुसार $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान क्या होगा?

यदि $u = x y^2 \tan^{-1}\left(\frac{y}{x}\right)$ है,तो $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ का मान ज्ञात कीजिए।

यदि $u = \log_e(x^2 + y^2) + \tan^{-1}\left(\frac{y}{x}\right)$ है,तो $\frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} = $

यदि $z=\sec (y-ax)+\tan (y+ax)$ है, तो $\frac{\partial^2 z}{\partial x^2}-a^2 \frac{\partial^2 z}{\partial y^2}$ का मान ज्ञात कीजिए।

यदि $u \equiv u(x, y) = \sin(y + ax) - (y + ax)^2$ है,तो यह क्या दर्शाता है?

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