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Please help me it is not grade it is just number 3

Please help me it is not grade it is just number 3

Algebra & Trigonometry with Analytic Geometry
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 2E
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Please help me it is not grade it is just number 3
sin(180° – x) sin(-x)+cos(90° +x) cos(x-450°) (3) sin (180°+ x)
Transcribed Image Text:sin(180° – x) sin(-x)+cos(90° +x) cos(x-450°) (3) sin (180°+ x)
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