જો $x^3+y^3=3axy$ હોય,તો $\left(\frac{3a}{2}, \frac{3a}{2}\right)$ બિંદુએ $3ay^{\prime \prime}+40$ ની કિંમત શોધો.

  • A
    $-5$
  • B
    $0$
  • C
    $8$
  • D
    $1$

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જો $x^2 \tan ^{-1} \frac{y}{x}-y^2 \tan ^{-1} \frac{x}{y}=k$ હોય,તો $\left(\frac{d y}{d x}\right)_{(1,1)}=$

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