tanx>-1
所以kπ-π/4
(sinx)^2>=3/4
-1<=sinx<=-√3/2,√3/2<=sinx<=1
所以2kπ+4π/3<=x<=2kπ+5π/3
2kπ+π/3<=x<=2kπ+2π/3
即kπ+π/3<=x<=kπ+2π/3
所以是kπ+π/3<=x
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