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

  • A
    $\sin 2u$
  • B
    $\frac{1}{2}\sin 2u$
  • C
    $2\tan u$
  • D
    $\sec^2 u$

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

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

$z=\tan (y+a x)+\sqrt{y-a x} \Rightarrow z_{x x}-a^2 z_{y y}$ ની કિંમત શોધો.

જો $f(x, y) = \frac{\cos(x - 4y)}{\cos(x + 4y)}$ હોય, તો $\left. \frac{\partial f}{\partial x} \right|_{y = \frac{x}{4}}$ ની કિંમત શોધો:

જો $u=e^{x^2-y^2}$ હોય,તો

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