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令√x = t， 则x→0时,t→0
原式= lim (cost)^(π/t²)
=lim (1 + (cost-1) )^(π/t²)
=lim (1 + (cost-1) )^(1/(cost-1) * (cost-1)π/t²)
=lim ( (1 + (cost-1) )^(1/(cost-1)) )^ (cost-1)π/t²)
注意到 cost-1与 -t²/2等价
所以原式 = e^(-π/2)
原式= lim (cost)^(π/t²)
=lim (1 + (cost-1) )^(π/t²)
=lim (1 + (cost-1) )^(1/(cost-1) * (cost-1)π/t²)
=lim ( (1 + (cost-1) )^(1/(cost-1)) )^ (cost-1)π/t²)
注意到 cost-1与 -t²/2等价
所以原式 = e^(-π/2)
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