lim1-cosx x2 lim底下是x→0

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lim1-cosxx2lim底下是x→0lim1-cosxx2lim底下是x→0lim1-cosxx2lim底下是x→0我错了,是0.51-cosx=2(sin(x/2))^2x趋于0时,sinx等价

lim1-cosx x2 lim底下是x→0
lim1-cosx x2 lim底下是x→0

lim1-cosx x2 lim底下是x→0
我错了,是0.5

1-cosx=2(sin(x/2))^2
x趋于0时,sinx等价于x
所以原式=2*(x/2)^2/(x^2)=1/2