Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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Question
**Using the Angle Between Two Vectors** In Exercises 39–42, find **u · v**, where θ is the angle between **u** and **v**. 39. \( ||\mathbf{u}|| = 9 \), \( ||\mathbf{v}|| = 36 \), \( \theta = \frac{3\pi}{4} \)
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Transcribed Image Text:**Using the Angle Between Two Vectors** In Exercises 39–42, find **u · v**, where θ is the angle between **u** and **v**. 39. \( ||\mathbf{u}|| = 9 \), \( ||\mathbf{v}|| = 36 \), \( \theta = \frac{3\pi}{4} \)
Expert Solution
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Step 1

Given Data :

Here we have given two vectors u,v with ||u||=9, ||v||=36

and the angle between θ=3π4.

 

Explanation :

From definition of vectors we have,

u.v=||u|| ||v|| cos(θ)

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