arctan1-arctan-1等于什么?
问题描述:
arctan1-arctan-1等于什么?
答
因为arctan1=kπ+π/4
因为arctan-1=kπ-π/4
所以原式=kπ+π/4+π/4=kπ+π/2 k属于整数
注意周期问题
答
arctan1-arctan-1=π/4-3π/4=-π/2
答
arctan1-arctan-1
=π/4-(-π/4)
=π/2