sin (19/6π) = sin(3π + π/6) = sin(π/6) = 1/2
cos (11/2π) = cos(5π + π) = cos(π) = -1
tg (16/3π) = tg(5π + π/3) = tg(π/3) = √3
ctg (-4/3π) = ctg(-π/3) = -√3
sin (19/6π) = sin(3π + π/6) = sin(π/6) = 1/2
cos (11/2π) = cos(5π + π) = cos(π) = -1
tg (16/3π) = tg(5π + π/3) = tg(π/3) = √3
ctg (-4/3π) = ctg(-π/3) = -√3