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Let y=sqrt(x+sqrt(x+sqrt(x+oo))) , (dy)/...

Let `y=sqrt(x+sqrt(x+sqrt(x+oo)))` , `(dy)/(dx)` is equal to

(a)`1/(2y-1)`

(b) `x/(x+2y)`

(c)`1/(sqrt(1+4x)`

(d) `y/(2x+y)`

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