x趋于0
y=(cos(sqrt(x)))^1/x
lny=ln(cos(sqrt(x)))/x
limlny=-sin(sqrt(x))/(2(sqrt(x))cos(sqrt(x)))
=lim(-1/2)tan(sqrt(x))/sqrt(x)
=-1/2
limy=e^(-1/2)
lim(cos(sqrt(x)))^1/x
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