sin(x-3派/4)cos(x-π/4)=-1/4,求cos4x

来源：学生作业帮助网编辑：六六作业网时间：2024/10/05 10:38:07

sin(x-3派/4)cos(x-π/4)=-1/4,求cos4xsin(x-3派/4)cos(x-π/4)=-1/4,求cos4xsin(x-3派/4)cos(x-π/4)=-1/4,求cos4x-

sin(x-3派/4)cos(x-π/4)=-1/4,求cos4x
sin(x-3派/4)cos(x-π/4)=-1/4,求cos4x

-1/2