Casio fx-991ES PLUS - Page 71

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