4cos(360+480)-sqrt(48sin(360+240))+ctg2^30????
cos(480) sin(240) ctg(360-α)= - ctg(α) ctg(270+α)= - tg(α)
cos(120) -sin(120) ctg(360+α)= ctg(α) ctg(180-α)= - ctg(α)
-cos(60) -sin(60) ctg(270-α)= tg(α) ctg(180+α)= ctg(α)
ctg(90-α)= tg(α) ctg(90-α)= - tg(α)