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?

  • A
    -$1$
  • B
    $0$
  • C
    $1$
  • D
    $2$

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

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જો $u = \tan^{-1}(\frac{y}{x})$ હોય,તો આઈલરના પ્રમેય મુજબ $x \frac{\partial u}{\partial x} + y \frac{\partial u}{\partial y}$ ની કિંમત શું થાય?

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