यदि $u = \log_e(x^2 + y^2) + \tan^{-1}\left(\frac{y}{x}\right)$ है,तो $\frac{\partial^2 u}{\partial x^2} + \frac{\partial^2 u}{\partial y^2} = $

  • A
    $0$
  • B
    $2u$
  • C
    $1/u$
  • D
    $u$

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Similar Questions

यदि $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ है,तो $(x+y+z)(u_x+u_y+u_z)$ का मान ज्ञात कीजिए।

यदि $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ है,तो $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{2}}$ का मान क्या होगा?

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।

यदि $u = \tan^{-1}\left(\frac{x^3 + y^3}{x - y}\right)$ है,तो $x\frac{\partial u}{\partial x} + y\frac{\partial u}{\partial y} = $

यदि $u^2 = (x - a)^2 + (y - b)^2 + (z - c)^2$ है,तो $\sum \frac{\partial^2 u}{\partial x^2} = $

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