Proof Prove that(cos θ)i + (sin θ)jis a unit vector for any value of θ.

Trigonometry (MindTap Course List)
10th Edition
ISBN:9781337278461
Author:Ron Larson
Publisher:Ron Larson
Chapter3: Additional Topics In Trigonometry
Section3.3: Vectors In The Plane
Problem 101E
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Proof Prove that
(cos θ)i + (sin θ)j
is a unit vector for any value of θ.

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