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What's New
Changes in version 2.6.1:
- Bug fix for calculator
Changes in version 2.6:
- Bug fix for plot function y=1/x
- New app preference/setting: use the system keyboard (some android versions have problems with input of negative numbers)
- Polynomal division (2. and 3. grade)
- Optic - lens equation
Changes in version 2.5:
- Add description vertex form

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