Trigonometry and Modelling
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Intervals, periods and reference angles

Intervals, periods and reference angles

Unit circle with quadrants labelled, reference angle alpha in quadrant I, matching angle 2π-alpha in quadrant IV, and cosine positive shown in quadrants I and IV

Trigonometric equations repeat, so the interval tells you how many solutions to look for. Before using inverse trig, check whether the question is in degrees or radians and match your calculator mode.

Trigonometry and Modelling Lesson

  1. A Level
  2. /Maths
  3. /Trigonometry and Modelling