Помогите пожалуйста((
7√2Sin 15π/8*Соs15π/8

7*√2*sin(15π/8)*cos(15π/8)=7*√2*√2*sin(15π/8)*cos(15π/8)/√2==7*2*sin(15π/8)*cos(15π/8)/√2=7*sin(15π/4)/√2