lim(2-x)tanπ/4x
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lim(2-x)tanπ/4xlim(2-x)tanπ/4xlim(2-x)tanπ/4x应用罗比达法则lim(2-x)tanπx/4=lim(2-x)/cot(πx/4)=lim(-1/[-πcsc
lim(2-x)tanπ/4x
lim(2-x)tanπ/4x
lim(2-x)tanπ/4x
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
lim(2-x)tanπ/4x
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