Question

Two vectors m and n are defined by 3i+4j and n=2i-j. find the angle between m and n​

Answer 1

`{ \ttm.n = } \\ { \tt{ (3 * 2) + (4 * - 1) = (5)( √(5)) \cos( \theta) }} \\ { \tt{ \cos( \theta) = (0.4)/( √(5) ) }} \\ \theta = 79.7 \degree`