lim(x→0)lncos2x/lncos3x

墟里烟雾2022-10-04 11:39:541条回答

lim(x→0)lncos2x/lncos3x
用等价无穷小量求

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gay28 共回答了19个问题 | 采纳率100%
lim(x→0)lncos2x/lncos3x
=lim(x→0)ln(1+cos2x-1)/ln(1+cos3x-1)
=lim(x→0) (cos2x-1)(cos3x-1)
=lim(x→0) (2x)^2/(3x)^2
=4/9
1年前

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