Ответ:
sin (60+a)+sin(60+a)=sin α * cos 60+cos α * sin 60+sin α * cos 60-cos α * sin 60=1/2sin α+√3/2cos α+1/2sin α-√3/2cos α=1/2sin α+1/2sin α=sin α
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Ответ:
sin (60+a)+sin(60+a)=sin α * cos 60+cos α * sin 60+sin α * cos 60-cos α * sin 60=1/2sin α+√3/2cos α+1/2sin α-√3/2cos α=1/2sin α+1/2sin α=sin α