sin(a-π⼀3)=1⼀3,则cos(π⼀6+a)=?

2025-03-24 08:54:06
推荐回答(2个)
回答1:

sin(a-π/3)=1/3
cos(π/6+a)=sin(π/2-π/6-a)=sin(π/3-a)=-sin(a-π/3)=-1/3

回答2:

-1/3