Example 9 -  Find value of cos (-1710) - Chapter 3 Class 11 - Examples

  1. Chapter 3 Class 11 Trigonometric Functions
  2. Serial order wise
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Eπ‘₯ample, 9 Find the value of cos (– 1710Β°). cos (–1710Β°) = cos (1710Β°) = cos (1710 Γ— πœ‹/180) = cos (19πœ‹/2) = cos (9 1/2Ο€) = cos (10Ο€ – πœ‹/2) = cos (– πœ‹/2) = cos (– 180/2) = cos (– 90Β°) = cos 90 = 0

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