What is the modulus and principal argument of the following complex number? 4(cos(−5?/4) + sin(−5?/4)?)

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter8: Applications Of Trigonometry
Section8.5: Trigonometric Form For Complex Numbers
Problem 28E
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What is the modulus and principal argument of the following complex number?
4(cos(−5?/4) + sin(−5?/4)?)

 

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