The Math Meridian
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Exact values for special angles up to 360°

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Useful for: MCR3U IB Math AA SL & HL AP® Precalculus

Learn it Use the special triangles (30-60-90 and 45-45-90) with the reference angle and the CAST rule. For example sin 150° = +sin 30° = 1/2 (quadrant 2: sine positive), cos 225° = −cos 45° = −√2/2.

Example: Exact value of cos 300°?

  1. Quadrant 4, reference angle 60°. Cosine is positive in Q4.
  2. cos 300° = cos 60° = 1/2.

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