Zeroed Nested root

Calculus Level 1

It's obvious that if \( d = 0 \), then \( \sqrt{d+\sqrt{d+\sqrt{d+\sqrt{d+\cdots}}}}\) is equal to 0.

But what is the value of the limit \[ \lim_{d\to0^+} \sqrt{d+\sqrt{d+\sqrt{d+\sqrt{d+\cdots}}}}\ ?\]

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