Answer
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Work Step by Step
$c\vec{v_1}\cdot d\vec{v_2}=cd(\vec{v_1}\cdot \vec{v_2})$, so if $\vec{v_1}\cdot \vec{v_2}=0$, then $c\vec{v_1}\cdot d\vec{v_2}=0$
Linear Algebra and Its Applications (5th Edition)
by Lay, David C.; Lay, Steven R.; McDonald, Judi J.
Published by
Pearson
ISBN 10:
032198238X
ISBN 13:
978-0-32198-238-4
Chapter 6 - Orthogonality and Least Squares - 6.2 Exercises - Page 347: 32
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