i +j +k andi – j -k.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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compute the angle between the vectors.

28. \(\mathbf{i} + \mathbf{j} + \mathbf{k}\) and \(\mathbf{i} - \mathbf{j} - \mathbf{k}\).

This expression involves vector notation, where \(\mathbf{i}\), \(\mathbf{j}\), and \(\mathbf{k}\) represent the unit vectors along the x, y, and z axes respectively. The first part, \(\mathbf{i} + \mathbf{j} + \mathbf{k}\), represents a vector that is the resultant of adding the unit vectors in each direction. The second part, \(\mathbf{i} - \mathbf{j} - \mathbf{k}\), represents a vector that subtracts the unit vectors in the y and z directions from the unit vector in the x direction.
Transcribed Image Text:28. \(\mathbf{i} + \mathbf{j} + \mathbf{k}\) and \(\mathbf{i} - \mathbf{j} - \mathbf{k}\). This expression involves vector notation, where \(\mathbf{i}\), \(\mathbf{j}\), and \(\mathbf{k}\) represent the unit vectors along the x, y, and z axes respectively. The first part, \(\mathbf{i} + \mathbf{j} + \mathbf{k}\), represents a vector that is the resultant of adding the unit vectors in each direction. The second part, \(\mathbf{i} - \mathbf{j} - \mathbf{k}\), represents a vector that subtracts the unit vectors in the y and z directions from the unit vector in the x direction.
**Vector Operations Exercise**

**Problem 31:** Calculate the vector expressions:

- \( \vec{i} + \vec{j} \) 
- \( \vec{i} + 2\vec{j} - \vec{k} \)

This problem involves understanding basic vector addition and subtraction. Each expression combines standard unit vectors \(\vec{i}\), \(\vec{j}\), and \(\vec{k}\). 

- The first expression, \( \vec{i} + \vec{j} \), sums the unit vectors in the x and y directions.
- The second expression, \( \vec{i} + 2\vec{j} - \vec{k} \), involves adding twice the unit vector in the y direction and subtracting the unit vector in the z direction. 

Practice visualizing these vectors in 3D space to understand their geometric interpretation.
Transcribed Image Text:**Vector Operations Exercise** **Problem 31:** Calculate the vector expressions: - \( \vec{i} + \vec{j} \) - \( \vec{i} + 2\vec{j} - \vec{k} \) This problem involves understanding basic vector addition and subtraction. Each expression combines standard unit vectors \(\vec{i}\), \(\vec{j}\), and \(\vec{k}\). - The first expression, \( \vec{i} + \vec{j} \), sums the unit vectors in the x and y directions. - The second expression, \( \vec{i} + 2\vec{j} - \vec{k} \), involves adding twice the unit vector in the y direction and subtracting the unit vector in the z direction. Practice visualizing these vectors in 3D space to understand their geometric interpretation.
Expert Solution
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Recall:

  If a and b be two vectors, then the angle between a and b is defined by

      cos θ=a·bab

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