Let \( x * y=x^{2}+y^{3} \) and \( (x * 1) * 1=x *(1 * 1) \). Then a value of \( 2 \sin ^{-1}\le...
Let \( x * y=x^{2}+y^{3} \) and \( (x * 1) * 1=x *(1 * 1) \). Then a value of \( 2 \sin ^{-1}\left(\frac{x^{4}+x^{2}-2}{x^{4}+x^{2}+2}\right) \)
(a) \( \frac{\pi}{4} \)
(b) \( \frac{\pi}{3} \)
(c) \( \frac{\pi}{2} \)
(d) \( \frac{\pi}{6} \)
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