问题
填空题
已知cos(x-
|
答案
∵cos(x-
)=π 6
,1 3
∴原式=cos[π+(x-
)]+sin[π 6
+(x-π 2
)]=-cos(x-π 6
)+cos(x-π 6
)=0.π 6
故答案为:0
已知cos(x-
|
∵cos(x-
)=π 6
,1 3
∴原式=cos[π+(x-
)]+sin[π 6
+(x-π 2
)]=-cos(x-π 6
)+cos(x-π 6
)=0.π 6
故答案为:0