6. Trigonometric Identities and More Equations
Introduction to Trigonometric Identities
Problem 5.65
Textbook Question
Textbook QuestionAdvanced methods of trigonometry can be used to find the following exact value.
sin 18° = (√5 - 1)/4
(See Hobson's A Treatise on Plane Trigonometry.) Use this value and identities to find each exact value. Support answers with calculator approximations if desired.
cos 18°
Verified SolutionThis video solution was recommended by our tutors as helpful for the problem above
Video duration:
0m:0s120
views
Was this helpful?
Related Videos
Related Practice
06:19
Showing 1 of 15 videos