# If #A = <5 ,6 ,-3 >#, #B = <-9 ,6 ,-5 ># and #C=A-B#, what is the angle between A and C?

##### 1 Answer

Nov 14, 2016

The angle is

#### Explanation:

Let's start calculating

To calculate the angle

we use the dot product definition:

The dot product

The modulus of

The modulus of