求教lim x→0 ( cos x / cos2x )^(1/x^2)
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求教lim x→0 ( cos x / cos2x )^(1/x^2)
求教lim x→0 ( cos x / cos2x )^(1/x^2)
求教lim x→0 ( cos x / cos2x )^(1/x^2)
用x=e^lnx和洛必达法则
求教lim x→0 ( cos x / cos2x )^(1/x^2)
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