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  4. x = (1- √y/ 1 + √y ) ⇒ (dy/dx) is equal to

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Q. $x = \frac{1- \sqrt{y}}{ 1 + \sqrt{y} } \Rightarrow \frac{dy}{dx} $ is equal to

BITSATBITSAT 2009

Solution:

Correct answer is (b) $\frac{4 \, x - 1 }{ x + 1^3}$