已知x²+y²+x+$\sqrt{3}$y+tanθ=0（﹣$\frac{\mathrm{\pi }}{2}$＜θ＜$\frac{\mathrm{\pi }}{2}$）表示圆，则θ的取值范围为____ 

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                                                 江碧鸟逾白，山青花欲燃。今春看又过，何日是归年？