Find the exact value of each expression. (a) sin 75° sin 5° = 0 (b) cos 105° - cos 15° = 0

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter2: Analytic Trigonometry
Section2.4: Sum And Difference Formulas
Problem 1ECP: Find the exact value of cos12.
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Find the exct value of each expression.
(a)
sin 75° sin 5°
=
(b)
cos 105°cos 15°
=
☐
Transcribed Image Text:Find the exct value of each expression. (a) sin 75° sin 5° = (b) cos 105°cos 15° = ☐
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