If \( \lim _{x \rightarrow 0} \frac{\sin ^{-1} x-\tan ^{-1} x}{3 x^{3}} \) is equal to \( l \), ...

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If \( \lim _{x \rightarrow 0} \frac{\sin ^{-1} x-\tan ^{-1} x}{3 x^{3}} \) is equal to \( l \), then the value of \( (6 l+1) \) is
(a) \( \frac{1}{6} \)
(b) \( \frac{1}{2} \)
(c) 6
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