lim(x->0+)(cos√x)^pi/x
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lim(x->0+)(cos√x)^pi/x
lim(x->0+)(cos√x)^pi/x
lim(x->0+)(cos√x)^pi/x
=lim(x->0+)[1-﹙1-cos√x﹚]^﹛[1/﹙1-cos√x﹚][π﹙1-cos√x﹚/x]﹜
∵lim[π﹙1-cos√x﹚/x]=π/2
∴原式极限=e^﹙﹣π/2﹚
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