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

  • A
    $\frac{1}{{{x^2} + {y^2}}}$
  • B
    $0$
  • C
    $\frac{{{x^2} - {y^2}}}{{{{({x^2} + {y^2})}^2}}}$
  • D
    $\frac{{{y^2} - {x^2}}}{{{{({x^2} + {y^2})}^2}}}$

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જો $u(x, y)=y \log x+x \log y$ હોય,તો $u_x u_y-u_x \log x-u_y \log y+\log x \log y$ ની કિંમત શું થાય?

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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?

જો $u = x^2 + y^2$ અને $x = s + 3t, y = 2s - t$ હોય,તો $\frac{d^2u}{ds^2} = $

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