题目内容
已知M是曲线
上的任一点,若曲线在M点处的切线的倾斜角均不小于
的锐角,则实数a的取值范围是( )
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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16185' and id < 1358703 and id<>'1358703' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16185' and id > 1358703 and id<>'1358703' order by id asc limit 5