sin(b)=0,8
Пошаговое объяснение:
ctg(a)=2;
tg(a)=1/2;
AD=(AC/2)×tg(a)
2=AC/4
AC=8;
AB²=AC²/4+AD²
AB²=64/4+4
AB=√20
AD=AB×sin(a)
2=√20×sin(a)
sin(a)=2/√20
AB×sin(b)=AC×sin(a)
√20×sin(b)=8×2/√20
sin(b)=16/20
