જો $z = y + f(v)$,જ્યાં $v = \frac{x}{y}$ હોય,તો $v \frac{\partial z}{\partial x} + \frac{\partial z}{\partial y}$ ની કિંમત શું થાય?

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

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જો $u = \log ({x^2} + {y^2})$ હોય,તો $\frac{{\partial ^2}u}{\partial {x^2}} + \frac{{\partial ^2}u}{\partial {y^2}} = $

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

જો $u = x^2 \tan^{-1}(\frac{y}{x}) - y^2 \tan^{-1}(\frac{x}{y})$ હોય,તો $\frac{\partial^2 u}{\partial x \partial y} = $

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

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