关于x的方程2cos2x-sinx+a0在区间[0,7π/6]上恰好有两个不等实根,则实数a的取值范围是_____。

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问题 关于x的方程2cos2x-sinx+a0在区间[0,7π/6]上恰好有两个不等实根,则实数a的取值范围是_____。
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