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Proof by Cases: 3. If y (x.y) = R2 (x and y are real numbers), then ||x|- | 3 IX - Yl (20 pts)

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Proof by Cases: 3. If y (x.y) = R2 (x and y are real numbers), then ||x|- \\ | 3 IX - Yl (20 pts) Proof by Contradiction: 4. The sum of the length of the sides of a right-triangle is greater than the length of its hypotenuse. (10 pts)

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