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

  • A
    $y:x$
  • B
    $x:y$
  • C
    $-y:x$
  • D
    $-x:y$

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

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?

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જો $u=f(r)$,જ્યાં $r^2=x^2+y^2$ હોય,તો $\left(\frac{\partial^2 u}{\partial x^2}+\frac{\partial^2 u}{\partial y^2}\right)$ ની કિંમત શું થાય?

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