VB版高级功能计算器，除了具有数学运算外，还包括三角函数、反三角函数、双曲三角函数、绝对值等运算，还可以进行一些比较复杂的表达式计算，比如 ln e + rnd(2) + 3(2)4 * (log(tan (itan 1))) 等。-VB version of the advanced features of the calculator, in addition to mathematical operations, including trigonometric, inverse trigo