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7.3 Exercise 12

Avg difficulty 2.5
  1. ⓐ Use the reference angle of 315° 315° to find cos(315°) \cos \left(315°\right) and sin(315°). \sin \left(315°\right) .
  2. ⓑ Use the reference angle of − π 6 - \frac{\pi}{6} to find cos( − π 6 ) \cos \left(- \frac{\pi}{6}\right) and sin( − π 6 ). \sin \left(- \frac{\pi}{6}\right) .

OpenStax Algebra and Trigonometry 2e, 7.3 Unit Circle, exercise 12

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.