Let vectors A⃗ =(2,1,−4), B⃗ =(−3,0,1), and C⃗ =(−1,−1,2). What is the angle θAB between A⃗ and B⃗ ?

Let vectors A⃗ =(2,1,−4), B⃗ =(−3,0,1), and C⃗ =(−1,−1,2).
What is the angle θAB between A⃗ and B⃗ ?

The answer is :

2 radians

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