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13. The vectors a, b, and c satisfy the relationship a = b + c. a. Show that a 2 = b 2 + 2b

13. The vectors a, b, and c satisfy the relationship a = b + c. a. Show that a 2 = b 2 + 2b . 2 + 2|2. b. If the vectors b and c are perpendicular, how does this prove the Pythagorean theorem

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