\( f(x)=e^{x}-e^{-x}-2 \sin x-\frac{2}{3} x^{3} \). Then the least value of \( n \) for \( \math...

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\( f(x)=e^{x}-e^{-x}-2 \sin x-\frac{2}{3} x^{3} \). Then the least value of \( n \) for
\( \mathrm{P} \) which \( \left.\frac{d^{n}}{d x^{n}} f(x)\right|_{x=0} \) is nonzero is

W
(1) 5
(2) 6
(3) 7
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