Description: 1, binary, octal, decimal and hexadecimal number of addition, subtraction, multiplication, division, multiplication, and module
2. Scientific calculation functions, including (anti-) sine, (anti) cosine, (anti) tangent, (anti) cotangent, open square, exponential, etc
3. Implement the above functions in both angles and radians (the calculation results can be carried out at random angles and radians).
4, have the memory of history calculation function (input and calculation expression can find expression history, such as expressions in the box does not exist in the history, such as historical existence is not do store operation, and to find out from the history of reflection to the input box and output box.)
5. The incorrect expression can be pointed out for the wrong reasons
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