Question

sin 5п/6 cos п/6+sin п/6 cos 5п/6 решить

Answer 1

$sin(alpha+beta)=sinalphacosbeta+cosalphasinbeta\sinfrac{5pi}6cosfracpi6+cosfrac{5pi}6sinfracpi6=sinleft(frac{5pi}6+fracpi6right)=sinfrac{6pi}6=sinpi=0$