2. Use the addition or subtraction formulas to find the exact value (a) cos 10 cos 80 – sin 10 sin 80 197 (b) sin 12 (c) cos(165) (d) sin(75) (e) tan(105)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.5: Product-to-sum And Sum-to-product Formulas
Problem 34E
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please answer all the parts

2. Use the addition or subtraction formulas to find the exact value
(a) cos 10 cos 80 – sin 10 sin 80
197
(b) sin
12
(c) cos(165)
(d) sin(75)
(e) tan(105)
Transcribed Image Text:2. Use the addition or subtraction formulas to find the exact value (a) cos 10 cos 80 – sin 10 sin 80 197 (b) sin 12 (c) cos(165) (d) sin(75) (e) tan(105)
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