Equation \( \frac{1}{(x+1)^{3}}-3 x+\sin x=0 \) has \( \mathrm{P} \...

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Equation \( \frac{1}{(x+1)^{3}}-3 x+\sin x=0 \) has
\( \mathrm{P} \)
(a) no real root
W
(b) two real and distinct roots
(c) exactly one negative root
(d) exactly one root between -1 and \( \infty \)
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