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What are the definitions of thwe following questions about signum functions: 1. What is sgn x? 2. What is sgn (x-3)? 3. What is sgn

What are the definitions of thwe following questions about signum functions:

1. What is sgn x?

2. What is sgn (x-3)?

3. What is sgn (x+3)?

4. What is sgn (x+3) + sgn (x-2)?

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