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If y=sqrt(logx+sqrt(logx+sqrt(logx+oo)))...

If `y=sqrt(logx+sqrt(logx+sqrt(logx+oo))),t h e n(dy)/(dx)i s` (a)`x/(2y-1)` (b) `x/(2y+1)` (c)`1/(x(2y-1))` (d) `1/(x(1-2y))`

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