Using the Angle Between Two Vectors In Exercises 39-42, find u. v, where 0 is the angle between u and v. 39. ||u|| = 9, ||v|| = 36, 0 3π 4

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Q: (c) Prove that cos 35°+cos 45°+cos 75°+cos 85° = 2 cos 5° cos 20°.

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