求幂 [英] Exponentiation

问题描述

在函数中编写指数的正确方法有点含糊不清
所以我会做个小测验

我要计算这个:

There is a little ambiguity on the proper way to write the exponents in a function 
So, I will make a little quiz

I want to compute this:

sin(3pi/4)  =    -0.70710678118654746

哪个答案是正确的?

sin(3pi/4)   =    -0.70710678118654746

Which answer is right ?

        Dim Teta As Double = 3 * Math.PI / 4
        Dim n As Double = 4
        Dim X As Double

        X = Math.Cos(Teta) ^ (2 / n) ' Returns: NaN

        X = (Math.Cos(Teta) ^ 2) ^ (1 / n) ' Returns: 0.840896415253715

        X = -0.70710678118654746 ^ (2 / n) ' Returns: -0.840896415253715

推荐答案

在任何情况下，最终结果均不应为负数.

The final result should not be a negative number under any circumstance.

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