sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/29 02:32:28
sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
x)+SS64~|t&#q \s Z6yc=V dR @mC ̷I*ҧ %v6C2@7`}p6I_\g/1

sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
sin²(π+α)-cos(π+α)*cos(-α+1)的值为?
sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?

sin²(π+α)-cos(π+α)*cos(-α+1)的值为?sin²(π+α)- cos(π+α)乘以cos(-α)+1的值为?
sin²(π+α)-cos(π+α)*cos(-α+π)
=sin²α-cos²α
=-cos2α