अगर \(y = \sqrt {x + \sqrt {x + \sqrt {x + ... \infty } } } \) तो \(\frac{{dy}}{{dx}}\) क्या है?

1
1
2
\(\frac{1}{{xy}}\)
3
\(\frac{1}{{2y - x}}\)
4
\(\frac{1}{{2y - 1}}\)

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