求lim(sec^2x-1)/(1-cosx)求极限lim(sec^2x-1)/(1-cosx)X-0

题目详情

求lim (sec^2 x-1)/(1-cos x)
求极限lim (sec^2 x - 1 )/(1-cos x) X-0

▼优质解答

答案和解析

用等价无穷小量
sec^2 x - 1 =tan^2x~x^2
1-cos x~x^2/2
所以原式=2

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