Find the angle between the surfaces defined by r2 = 9 and x + y + z2

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Find the angle between the surfaces defined by r2 = 9 and x + y + z2 = 1 at the point (2, – 2, 1).
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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