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锐角三角函数在全章中同时具备重点、难点、关键三者的作用,是历年中考的必考内容。从近几年的中考试题来看,考查的知识点有:(1)锐角三角函数的定义;(2)特殊角的三角函数值;(3)互余两角的三角函数的关系;(4)锐角三角函数的简单运用。一、考查锐角三角函数定义例1 (2005年上海市)已知Rt△ABC中,∠C=
The acute angle trigonometric function has the key, difficult, and key roles in the entire chapter. It is a must-examination content for the annual examination. From the mid-term examination questions in recent years, the points of examination are: (1) the definition of the acute angle trigonometric function; (2) the trigonometric function value of the special angle; (3) the relationship between trigonometric functions of the remaining two corners; (4) ) Simple use of acute angle trigonometric functions. First, examine the trigonometric function definition example 1 (in 2005 in Shanghai) known Rt △ ABC, ∠C =