cos(x-pai/4)=3/5,则sin(x+pai/4)
问题描述:
cos(x-pai/4)=3/5,则sin(x+pai/4)
答
利用诱导公式
sin(x+π/4)
=sin[π/2-(π/4-x)]
=cos(π/4-x)
=cos(x-π/4)
=3/5