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Math · Trigonometry
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Verify the following identity. cos (A+ B)- cosA cos B- sin A sin B cos (A+ B) cos (A-(-B)) Cosine Angle Difference Identity Negative Angle Identity (Do not simplify.) -Simplify completely Therefore, cos (A+ B) cos A cos B sin A sin B
h AABC, mZA S5 c 12 ft, and a 15 ft. Use the Law of Sines to find mZC Do not round until the final answer. Then round to the nearest tenth as needed.)
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