lim(x→0)[x^2(tanx)^2]/[(1-cosx)^2]
2个回答
典型等价无穷小代换法求
x→0,tanx~x,(1-cosx)~x^2/2
代入得
lim(x→0)[x^2*x^2]/[(x^2/2)^2]
lim(x→0)[x^4]/[x^4/4]
=4
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