Write the expression as the cosine of an angle, knowing that

Last updated: 7/17/2022

Write the expression as the cosine of an angle, knowing that the expression is the right side of the formula for cos (α - β) with particular values for α and β. cos (160°) cos (40°) + sin (160°) sin (40°) cos (210°) cos (190°) cos (220°) cos (120°)