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最近,我校高三数学考试录用了某刊物上的一个题目: A、B是一个锐解三解形的两个内角,且tgA、tgB是方程x~2+mx+m+1=0的两个实根,则m的取值范围是:[ ]。
Recently, the high school mathematics exam of our school has adopted a topic in a journal: A and B are two internal angles that sharply solve the three solutions, and tgA and tgB are the two equations x~2+mx+m+1=0. For real roots, the range of m is: [ ].