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

  • A
    $\frac{1}{2}\sin z$
  • B
    $\frac{1}{2}\tan z$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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यदि $u=\sin ^{-1}\left(\frac{x^4+y^4}{x+y}\right)$ है,तो $x \frac{\partial u}{\partial x}+y \frac{\partial u}{\partial y}$ का मान ज्ञात कीजिए।

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

यदि $u=e^{x^2-y^2}$ है,तो

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