96 помогите прошу вас

Ответ. 1. cos(2*arcsin(-1/2))=(cos(arcsin(-1/2))^2-(sin(arcsin(-1/2))^2=1-2*(sin(arcsin(-1/2))^2=1-2*(1/4)=0,5;
2. tg(2*arcsin(2/3))=(sin(2*arcsin(2/3))/(cos(2*arcsin(2/3))=(2*sin(arcsin(2/3)*(1-(sin(arcsin(2/3))^2))^0,5)/(1-2*(sin(arcsin(2/3))^2)=((4/3)*(1-4/9)^0,5)/(1-8/9)=4*5^0,5;