Description: As the source is collected by the Internet (former English), there may be a little failure to perfect. However, after testing, the majority of basic computing can, of course, including the commonly used functions (trigonometric functions,反三角函数, hyperbolic trigonometric functions, absolute value and even some .......), infinitely more complex expression can be calculated, such as: ln e+ rnd (2)+ 3 (2) 4* (log (tan (itan 1))) and so on. It is worth mentioning that, it also function mapping, data and custom constants and other functions. In addition, the procedures after I finished (only in the interface), more easy to understand.
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