cos = a·b/|a|·|b|
a·b = 2·2 + 4·(–1) = 0
|a| = √22+42 = √20
|b| = √22+(–1)2 = √5
cos = 0/(√20·√5) = 0/10 = 0
Пошаговое объяснение:
cos = a·b/|a|·|b|
a·b = 2·2 + 4·(–1) = 0
|a| = √22+42 = √20
|b| = √22+(–1)2 = √5
cos = 0/(√20·√5) = 0/10 = 0
Пошаговое объяснение: