In Exercises 49-52, find u*v, where 0(feta) is the angle between u and v. How to find mag - sqrt u*2 + v*2
How to find u*v - 0=cos*-1(u*v/|u||v|)
49. |u|=4, |v|=10, 0=2pi/3
50. |u|=100, |v|=250, 0=pi/6
51. |u|=9, |v|=36, 0=3pi/6
52. |u|=4, |v|=12, 0=pi/3