જો $z = \frac{y}{x} \left[ \sin \frac{x}{y} + \cos \left( 1 + \frac{y}{x} \right) \right]$ હોય,તો $x \frac{\partial z}{\partial x}$ કોના બરાબર થાય?

  • A
    $y \frac{\partial z}{\partial y}$
  • B
    $-y \frac{\partial z}{\partial y}$
  • C
    $2 y \frac{\partial z}{\partial y}$
  • D
    $2 y \frac{\partial z}{\partial x}$

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વાસ્તવિક સંખ્યાઓ $x$ અને $y$ માટે $2x^{2} + y^{2} + 2xy + 2x - 3y + 8$ ની ન્યૂનતમ કિંમત શું છે?

જો $z = \tan^{-1}\left(\frac{x}{y}\right)$ હોય,તો $z_x : z_y = $

જો $u \equiv u(x, y) = \sin(y + ax) - (y + ax)^2$ હોય,તો તે શું સૂચવે છે?

જો $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ હોય,તો $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{2}}$ ની કિંમત શું થાય?

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