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三角形中三角函数的计算问题,学生往往对函数值的取舍不能作出正确的判断,为此本文给出三角形中函数值取舍的判断方法.
In the calculation of trigonometric functions in triangles, students can not make proper judgments on the choice of function values. For this reason, this paper gives the method for judging the function values in triangles.