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三角函数的性质是三角函数重要内容,由于近几年对三角变换的考查要求有所降低,这必然会加强对三角函数性质的考查.研究三角函数的性质一定不要忽略它的定义域.
The nature of the trigonometric function is an important part of the trigonometric function. Since the requirement for examination of the trigonometric transformation has been reduced in recent years, this will inevitably enhance the examination of the nature of the trigonometric function. The nature of the trigonometric function must not ignore its domain of definition.