(a) If u and v have the same magnitude, show that u + v and u -...

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(a) If u and v have the same magnitude, show that u + v and u - v are orthogonal. 

(b) Use this to prove that an angle inscribed in a semicircle is a right angle (see the figure).

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Precalculus

ISBN: 978-0321716835

9th edition

Authors: Michael Sullivan

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