यदि $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ है, तो $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{4}}$ का मान ज्ञात कीजिए:

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

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यदि $u = u(x, y) = \sin(y + ax) - (y + ax)^2$ है, तो निम्नलिखित में से कौन सा सत्य है?

यदि $u=e^{x^2-y^2}$ है,तो

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

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।

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