若sin(125°-α)=12/13,则sin(α+55°)=_.

问题描述:

若sin(125°-α)=

12
13
,则sin(α+55°)=______.

∵sin(125°-α)=

12
13

∴sin(α+55°)=sin[180°-(125°-α)]=sin(125°-α)=
12
13

故答案为:
12
13