※ 引述《bitchdog (PEaCE)》之銘言：
: lim sec(x)
: x→(π/2)- ________
: tan(x)
sec(x)
lim --------
x→(π/2)- tan(x)
1/(cos(x))
= lim -------------------
x→(π/2)- (sin(x))/(cos(x))
1 1
= lim -------- = --- = 1
x→(π/2)- sin(x) 1
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