Question

利用连续函数求极限 lim(x→无穷大) π/2-arctan√(2x+1)

Answer 1

题目应该再严谨一点：
lim(x→+∞) π/2-arctan√(2x+1)
=π/2 - lim(x→+∞) arctan√(2x+1)
换元,t=√(2x+1)>0,x=(t^2-1)/2
=π/2 - lim((t^2-1)/2→+∞) arctant
=π/2 - lim(t→+∞) arctant
=π/2 - π/2
=0
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