求lim(1-cos2x)/x^2极限,x→0

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求lim(1-cos2x)/x^2极限,x→0求lim(1-cos2x)/x^2极限,x→0求lim(1-cos2x)/x^2极限,x→0利用等价无穷小x→0,则2x→0,所以1-cos2x等价于(2

求lim(1-cos2x)/x^2极限,x→0
求lim(1-cos2x)/x^2极限,x→0

求lim(1-cos2x)/x^2极限,x→0
利用等价无穷小
x→0,则2x→0,所以1-cos2x等价于(2x)^2/2=2x^2
直接替换原式=lim2x^2/x^2=2