若sin(125°-α)=12/13,则sin(α+55°)=_.
问题描述:
若sin(125°-α)=
,则sin(α+55°)=______. 12 13
答
∵sin(125°-α)=
,12 13
∴sin(α+55°)=sin[180°-(125°-α)]=sin(125°-α)=
.12 13
故答案为:
12 13