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近几年来,高考题降低了对三角恒等变换的考查难度,而加强了对三角函数图像与性质的考查;降低了对三角函数基础知识的考查要求,而加强了对数学思想和数学方法在考查三角函数基础知识和技能时的渗透,这是因为三角函数的性质(包括三角函数的定义域、值域、奇偶性、单调性和周期性)是研究三角函数的主体,
In recent years, the college entrance examination question has reduced the difficulty of the examination of the trigonometric identity transformation, and has strengthened the examination of the trigonometric function images and properties; reduced the examination requirements for the basic knowledge of trigonometric functions, and strengthened the mathematical thinking and mathematical methods in Examine the infiltration of the basic knowledge and skills of trigonometric functions, because the nature of trigonometric functions (including the domain, range, parity, monotonicity, and periodicity of trigonometric functions) is the main body of the study of trigonometric functions.