tg(3π/2+a)sin(2π-a) =
= - сtg a · (-sin a) =
= cos a ·sin a:sin a = cos a
tg(3π/2+α)*sin(2π-α)=(-ctgα)*(-sinα)=cosα.
tg(3π/2+a)sin(2π-a) =
= - сtg a · (-sin a) =
= cos a ·sin a:sin a = cos a
tg(3π/2+α)*sin(2π-α)=(-ctgα)*(-sinα)=cosα.