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近年来许多高考复习资料中出现了一类解决三角形中三角函数的取值范围问题,此类问题不仅考查了正弦定理、余弦定理在解三角形中的应用,而且还考查了不等式的应用和三角函数的恒等变形的能力,有一定的综合性.但有时在题目的设计或者提供解法时并没有注意到题设的条件对角的范围约束而产生了较为隐蔽的错误.问题1在锐角△ABC中,角A、B、C所对边分
In recent years, many college entrance examination review materials appeared in a triangular solution to solve the problem of the range of values, such problems not only examined the sine and cosine theorem in solving the triangle, but also examined the application of inequalities and trigonometric functions There is a certain degree of comprehensiveness, but sometimes in the design of the subject or provide solutions to the problem did not pay attention to the constraints of the scope of the conditions resulting in a more subtle error. Question 1 at the acute angle △ ABC In the corner A, B, C on the edge of the points