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how can i solve this angle between vectors?

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nurul aqilah
nurul aqilah 2015-12-4
回答： VBBV 2023-3-15
Find the angle between the vectors a and b given that a = 3; b = 5; and a-b = 7:

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Andrei Bobrov
Andrei Bobrov 2015-12-4
编辑：Andrei Bobrov 2015-12-4

Law of cosines

a = 3; 
b = 5;
c = 7; % c = a - b

alpha = acos((a.^2 + b.^2 - c.^2)./(2*a*b));
VBBV
VBBV 2023-3-15
Ran in:
a = 3;
b = 5;
c = 7;
alpha = acosd((a.^2 + b.^2 - (c).^2)./(2*a*b))
alpha = 120.0000

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