已知Sin(60°-α)=1/3,求Sin（30 °+α ）和Sin(480 °+α)的值。

熱心網友

Sin（30 °+α ）=Sin[90 °-(60°-α)]=Cos(60°-α)=±(2√2)/3Sin(480 °+α)=Sin(360°+120°+α)=Sin(120°+α)=Sin[180°-(60°-α)]=Sin(60°-α)=1/3

熱心網友

1、sin(30°+α)=sin[90°-(60°-α)]=cos(60°-α)=+/-(2根號2/3)2、sin(480°+α)=sin(120°+α)=sin[180-(60°-α)]=sin(60°-α)=1/3

熱心網友

Sin（30 °+α ）=Sin[90 °-(60°-α)]=Cos(60°-α)=±(2√2)/3Sin(480 °+α)=Sin(120°+α)=Sin[180°-(60°-α)]=Sin(60°-α)=1/3,