If \( y=\sqrt{\cos x+\sqrt{\cos x+\sqrt{\cos x+\ldots} \text { to }...
If \( y=\sqrt{\cos x+\sqrt{\cos x+\sqrt{\cos x+\ldots} \text { to } \infty}} \), then
\( \mathrm{P} \)
W \( \frac{d y}{d x}= \)
(A) \( \frac{\sin x}{2 y-1} \)
(B) \( \frac{\cos x}{2 y-1} \)
(C) \( \frac{2 y-1}{\sin x} \)
(D) \( -\frac{\sin x}{2 y-1} \)
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