For \( y=\cos ^{-1} \frac{x^{2}}{1+x} \), incorrect statement is (a) Implicit form is \( (1+x) \...

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For \( y=\cos ^{-1} \frac{x^{2}}{1+x} \), incorrect statement is
(a) Implicit form is \( (1+x) \cos y=x^{2} \)
(b) \( x \in\left[\frac{1-\sqrt{5}}{2}, \frac{1+\sqrt{5}}{2}\right] \)
(c) \( x \in\left[-3 \sin 18^{\circ}, \sin 54^{\circ}\right] \)
(d) \( x \in\left[-2 \sin 18^{\circ}, 2 \sin 54^{\circ}\right] \)
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