Casio fx-570ES PLUS User Manual page 71

Example 7: Determine the angle formed by VctA and VctB to three
, which becomes θ = cos
decimal places (Fix 3). (Angle unit: Deg)
(A∙B)
(cosθ =
|A||B|
(Abs)
(Abs)
(A∙B)
-1
|A||B|
(SETUP) (Fix)
(VECTOR)
(VECTOR)
(VECTOR) (VctB)
(VECTOR)
(VECTOR)
-1
(cos )
70
)
(VctA)
(Dot)
(VctA)
(VctB)