知识问答
最佳答案:证明辅助角公式就是利用其原理来证明,其实就只需要说明一下即可.其实就是两角正余弦和或差公式的逆用我们常见asinα+bcosα=根号(a方+b方)(a/根号(a
最佳答案:It has passed its sell-by date.It has passed its best before date.It is overdue.