Let r = (x, y, z) and e r =r/ r. Show that if a function (x,
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Let r = (x, y, z) and er =r/ ΙΙrΙΙ. Show that if a function ƒ(x, y, z) = F(r) depends only on the distance from the origin r = ΙΙrΙΙ= √x2 + y2 + z2, then
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Vf = F'(r)er
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