Question

вычислите cos(a+п/6) - cos(a-п/6)
a- альфа

Answer 1

cos(α+π/6)-cos(α-π/6)=-2*sin((α+π/6+α-π/6)/2)*sin((α+π/6-α+π/6)2)=
=-2sinα*sinπ/6=-sinα.