дорый ночи помогите tg(2arcsin2/3);sin(2arccos1/4)

tg(2arcsin2/3)=sin(2arcsin2/3)/cos(2arcsin2/3)=(2sin(arcsin2/3)cos(arcsin2/3))/(1-2sin^2(arcsin2/3)=(4/3(sqrt(1-4/9))/(1-8/9)=(4/3*sqrt(5/9))/(1/9)=4sqrt(5)