Ответ:
α = 45°
Объяснение:
a · b = 3 · 9 + 6 · 3 = 27 + 18 = 45
|a| = √3^2+6^2 = √9+36 = √45 = 3√5
|b| = √9^2+3^2=√81+9=√90=3√10
cos α = 45/3√5 * 3√10 = 0,5 * √2 = 0.7071067811865476
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Ответ:
α = 45°
Объяснение:
a · b = 3 · 9 + 6 · 3 = 27 + 18 = 45
|a| = √3^2+6^2 = √9+36 = √45 = 3√5
|b| = √9^2+3^2=√81+9=√90=3√10
cos α = 45/3√5 * 3√10 = 0,5 * √2 = 0.7071067811865476
α = 45°