HP 35s Scientific θ, 3, 3,  Õ, 3, 3 , 3  , ACOS(A B/ AB ), 3  , Angle between vectors, 9(), 9(), 9(), 9(), vectors is

		Presses for dot product
		,and the dot product of two
		vectors is 28

Angle between vectorsThe angle between two vectors, A and B, can be found as θ =ACOS(A B/ A B )Find the angle between two vectors: A=[1,0],B=[0,1]

Keys:Display:Description:

9()

9()

  3  

Õ

3 

Õ

3  Õ3 

 

  

￿Find the angle between two vectors: A=[3,4],B=[0,5]

Switches to ALG mode Sets Degrees mode Arc cosine function Enters vector A [1,0]

Enters vector B [0,1] for dot product of A and BFinds the magnitude of vector A [1,0]Finds the magnitude of vector B [0,1]The angle between two vectors is 90

Keys:	Display:	Description:
9()		Switches to RPN mode
9()		Sets Degrees mode
3  		Finds the dot product of
3 		two vectors

3  		Finds the magnitude of
		vector [3,4]

Vector Arithmetic 10-5