MCQ
If $\sqrt{\frac{x}{y}}+\sqrt{\frac{y}{x}}=4$, then $\frac{d y}{d x}=$___________
- A$\frac{y-7 x}{7 x-y}$
- ✓$\frac{7 y-x}{y-7 x}$
- C$\frac{y+7 x}{7 y-x}$
- D$\frac{7 x+y}{x-7 y}$
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