જો $u = \sin^{-1}\left(\frac{x}{y}\right) + \tan^{-1}\left(\frac{y}{x}\right)$ હોય, તો $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ નું મૂલ્ય શું થાય?

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    આમાંથી કોઈ નહીં

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

જો $u=\log \left(x^3+y^3+z^3-3 x y z\right)$ હોય,તો $(x+y+z)(u_x+u_y+u_z)$ ની કિંમત શોધો.

જો $u = \sin^{-1} \sqrt{\frac{x^2 + y^2}{x + y}}$ હોય,તો $x u_x + y u_y$ ની કિંમત શોધો.

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

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