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bammcool
@bammcool
August 2022
1
4
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Даны векторы
|c|=2
|d|=4
угол (c,d)=0 градусов
Найти: c*(d-3c)
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Dимасuk
Verified answer
C(d - 3c) = cd - 3c²
c•d = |c|•|d|•cos(c^d)
c•d = 2•4•cos0° = 8•1 = 8
3c² = 3•2²•cos0 = 3•4 = 12
c•d - 3c² = 8 - 12 = -4
Ответ: -4
(Над всеми буквами должны стоять стрелки, т.к. это векторы)
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Answers & Comments
Verified answer
C(d - 3c) = cd - 3c²c•d = |c|•|d|•cos(c^d)
c•d = 2•4•cos0° = 8•1 = 8
3c² = 3•2²•cos0 = 3•4 = 12
c•d - 3c² = 8 - 12 = -4
Ответ: -4
(Над всеми буквами должны стоять стрелки, т.к. это векторы)