Casio calculator scientific fx 570 991es plus free

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## 2.4.1
* Update math engine (faster and more powerful)
* Improve limit function
* Improve integral function
* Button [FUNC] Support more than 100 functions
* Support insert matrix by two bracket { }
* Zoom in/out without go to setting
* Improve draw parentheses
* Improve click MR in pocket mode
* Fixed long click clear variables value not working

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