lim(2-x)tanπ/4x
1个回答
应用罗比达法则
lim(2-x)tanπx/4
=lim(2-x)/cot(πx/4)
=lim(-1/[-πcsc^2(πx/4)/4])
=4limsin^2(πx/4)/π
=4/π
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