f(x)=tan(x/2+π/4).
kπ-π/2
kπ-3π/4
(2kπ-3π/2,2kπ+π/2),k∈Z
(2)
∵-3π/2<-1<0<1<π/2
f（x) 在 (-3π/2,π/2)上递增
∴f(-1)
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