lim (sinx)/x = 1 [这是两个特殊极限之一,x不可以是角度,一定要用弧度,一般书上都有证明]
x→0
lim (sinx)/x² = lim (sinx)/x × lim 1/x = 1 × ±∞ = ±∞ [不存在]
x→0 x→0 x→0
楼主如果不明白,欢迎追问.
lim (sinx)/x = 1 [这是两个特殊极限之一,x不可以是角度,一定要用弧度,一般书上都有证明]
x→0
lim (sinx)/x² = lim (sinx)/x × lim 1/x = 1 × ±∞ = ±∞ [不存在]
x→0 x→0 x→0
楼主如果不明白,欢迎追问.