Question

Soal vektor
|v| = (0,2,-3)
|w| = (2,6,7)
Hitunglah |v| . |w| dan besar sudut |v| & |w|?

Answer 1

V.w = 0 x 2 + 2 x 6 + -3 x 7
      = 0 + 12 - 21
      = - 9
IvI = 
     = √13
IwI = 
     = √89
cos α = 
         = 
         =