Find the exact value of each expression by applying trig formulas (Addition and Subtraction Formulas, Double-Angle, Half-Angle, and Product-Sum formulas): 1) cos² () - sin² () 2) cos 37.5° cos 7.5° Must show work and express your final answer as a fraction. Do not round your answer as a decimal.

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 62E
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Find the exact value of each expression by applying trig formulas (Addition and Subtraction Formulas, Double-Angle, Half-Angle, and Product-Sum formulas):
1) cos² (F) - sin²
(F)
2) cos 37.5° cos 7.5°
Must show work and express your final answer as a fraction. Do not round your answer as a decimal.
Transcribed Image Text:Find the exact value of each expression by applying trig formulas (Addition and Subtraction Formulas, Double-Angle, Half-Angle, and Product-Sum formulas): 1) cos² (F) - sin² (F) 2) cos 37.5° cos 7.5° Must show work and express your final answer as a fraction. Do not round your answer as a decimal.
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