Math提供了简单的数学函数，比如三角函数和对数函数。
Math provides simple math functions, such as trigonometric functions and logarithmic functions.
一般的计算器都具有四则运算、开方运算等功能，而科学计算器还具有三角函数，指数函数，对数函数等运算功能。
Almost calculator can finish basic arithmetic and root square operation. The science calculator can even process trigonometric function, exponential function and logarithmic function.
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