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lim(x→0)[e^x-e^(-x)]/sinx=?
lim (e^sinx-e^x)/(sinx-x)
lim (x→0) (e^x-x)^(1/sinx)
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x-0 lim(e^x-e^-x)/sinx
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lim X→0 [(1/(e^x-1))-(1/sinx)]
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求lim(n→0)(e^x-e^-x-2x)/(x-sinx)
lim(e^tanx-e^3x)/sinx
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x→0时lim[e^x+(e^-x)-2]/sinx^2