4) 5. Use the Law of cosines to prove the identity COS A COS B + cos C + a2 + 62 + 2 a
4) 5. Use the Law of cosines to prove the identity COS A COS B + cos C + a2 + 62 + 2 a b = 2abc135 DIES esc C G Search or type URL 6. Let u = 52 - 7j and v = 2i + j. Find a unit vector in the direction of 2u + 7v. Verify y
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