Даны векторы: 𝑎⃗ = (−2; 1; 1), 𝑏⃗⃗ = (1; 0; 1). Найти угол между векторами 𝑐⃗ и 𝑑⃗, если: 𝑐⃗ = 𝑎⃗ + 𝑏⃗⃗, 𝑑⃗ = 𝑎⃗ − � ⃗ = 𝑎⃗ + 𝑏⃗⃗ = (−2; 1; 1) + (1; 0; 1) = (−2 + 1; 1 + 0; 1 + 1) = (−1; 1; 2)

𝑐⃗ = 𝑎⃗ + 𝑏⃗⃗ = (2; 1; 1) + (1; 0; 1) = (2 + 1; 1 + 0; 1 + 1) = (1; 1; 2)
𝑑⃗ = 𝑎⃗ 𝑏⃗⃗ = (2; 1; 1) + (1; 0; 1) = (2 1; 1 0; 1 1) = (3; 1; 0)