6. Trigonometric Identities and More Equations
Double Angle 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°
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