67-72 - Value of a Product or Sum Find the value of the prod- uct or sum. 67. 2 sin 52.5° sin 97.5° 68. 3 cos 37.5° cos 7.5° 69. cos 37.5° sin 7.5° 70. sin 75°+ sin 15° 71. cos 255° - cos 195° 72. cos + cos 12 12
67-72 - Value of a Product or Sum Find the value of the prod- uct or sum. 67. 2 sin 52.5° sin 97.5° 68. 3 cos 37.5° cos 7.5° 69. cos 37.5° sin 7.5° 70. sin 75°+ sin 15° 71. cos 255° - cos 195° 72. cos + cos 12 12
Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter7: Analytic Trigonometry
Section7.3: Double-angle, Half-angle, And Product-sum Formulas
Problem 68E: 67-72. Value of a Product or Sum Find the value of the product or sum. 3cos37.5cos7.5
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