求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程,

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求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程,
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求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程,
求lim (sec^2 x
求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程,

求lim (sec^2 x求极限lim (sec^2 x - 1 )/(1-cos x) X-0请写出过程,
lim (sec^2 x - 1 )/(1-cos x)
=lim(tan^2x)/(2sin^2(x/2))
=lim(x^2 )/(0.5x^2)
=2

Limit[Sec[x]^2 - 1, x -> 0]=0 Limit[Sec[x^2] - 1, x -> 0]=0

结果就是2