# If #A = <7 ,-5 ,6 >#, #B = <4 ,-8 ,9 ># and #C=A-B#, what is the angle between A and C?

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Douglas K.
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Oct 13, 2016

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Compute vector C:

Compute the dot-product of vectors A and C:

There is another form for the equation of the dot-product that contains the angle between the two vectors:

Compute the magnitude of vector A:

Compute the magnitude of vector C:

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