How does a calculator screen work?

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6. What is the function of f6 key?
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Tags

1. #ability
2. #light
3. #batteries
4. #liquid
5. #polarizers
6. #years
7. #crossed
8. #solar
9. #rotate
10. #relative
11. #others
12. #display
13. #crystals
14. #small
15. #outside
16. #calculators
17. #button
18. #power
19. #operate
20. #laminated
21. #polarized