用java.util.Scanner
在main method讓User輸入一個值 , 命名為x
Create a method named af
算出f(x) = x^21並output
Revert "用java.util.Scanner"

This reverts commit 4f547afa72ebd581343359e6cea9f6407a24f315.
不小心按到revert@@程式碼都不見了
Create a mathod named bf

算出f(x) = sin(x)並output
Create two mathod named cf & df

算出f(x) = cos(x)和f(x) = tan(x)並output兩數
Create two method named ef & ff

算出f(x) = cos(x) + 5sin(x)和f(x) = 5cos(x) + sin(x)並output兩數
The end of this project

Create a mathod name gf
算出f(x) = log(x) + x^2並output
作業完成。