Помогите сделать, 10 класс алгебра

   cos 10/3π=cos(3π+π/3)=cos(2π+π+π/3)=cos(π+π/3)=-cosπ/3=-1/2    tg 750=tg(720+30)=tg30=√3/3    sin25π/3=sin(8π+π/3)=sinπ/3=√3/2    ctg(-29π/4)=-ctg(7π+π/4)=-ctgπ/4=-1