(701, #13) Find the angle between the vectors a = <1,2 > and b = < 12,-5 >. (First find an exact expression and then approximate to the nearest degree.)
Solution:
First of all,
= <1,2 >
< 12,-5 > = 2
Secondly,
=
,
= 13
by: gm
= <1,2 >
< 12,-5 > = 2
=
,
= 13
