Let f(x,y) = exp(-(x2 + y2) / 4). Guess where div F is positive and where it

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Let f(x,y) = exp(-(x2 + y2) / 4). Guess where div F is positive and where it is negative. Then determine this analytically?
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Calculus

ISBN: 978-0131429246

9th edition

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

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