В базисе векторов p ⃗ и q ⃗: (|p ⃗ |=2,|q ⃗ |=3,∠p ⃗q ⃗=π/3)
заданы вектора a ⃗ и b ⃗:
a ⃗ = (m + 1) p ⃗ + n q ⃗
b ⃗ = n p ⃗ – (m+1) q ⃗
Найти косинус угла между векторами a ⃗ и b ⃗
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