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Mathematics for the College Entrance Examination: What does it mean that the trigonometric function of absolute value changes periodically and the string is halved?
1. If the periods of sin (wt+fai) and cos (wt+fai) are t, then | sin (wt+fai) | and | cos (wt+fai) | are T/2.
2. if the periods of tan (wt+fai) and cot (wt+fai) are t, then | tan (wt+fai) | and | cot (wt+fai) | are t.
3, understanding: graphics, the absolute value will be positive, flip along the X axis.