Let (x, y, z) = ex 2 y 2 z2 = e r2 , with r as
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Let ƒ(x, y, z) = e−x2−y2−z2 = e−r2 , with r as in Exercise 35. Compute ∇ƒ directly and using Eq. (9).
Data From Exercise 35
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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Direct computation gives V fx fy f 2xex2ye...View the full answer
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Let r = (x, y, z) and e r =r/ r. Show that if a function (x, y, z) = F(r) depends only on the distance from the origin r = r= x 2 + y 2 + z 2 , then Vf = F'(r)er
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