(a) Let f: R → R be a differentiable function such f(tx) = tf(x) for all t ≤ R, x € Rª and some fixed me N. Show that: n [ i=1 af Xi ¹Jxi = mf(x) = Hint: Consider the function g(t) = f(tx) and g'(1) (b) Let f: Rn → R be a non-linear function such that f(tx) = tf(x) for all t = R, x ER". Show that f is not differentiable at 0.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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1. (a) Let f: R" → R be a differentiable function such f(tx) = tm f(x) for all t € R, ï ¤ R" and some
fixed me N. Show that:
i=1
Xi
af
əxi
=
mf(x)
Hint: Consider the function g(t) = f(tx) and g'(1)
(b) Let f: R → R be a non-linear function such that f(tx) = tf(x) for all t ≤ R, x ER". Show that
f is not differentiable at 0.
Transcribed Image Text:1. (a) Let f: R" → R be a differentiable function such f(tx) = tm f(x) for all t € R, ï ¤ R" and some fixed me N. Show that: i=1 Xi af əxi = mf(x) Hint: Consider the function g(t) = f(tx) and g'(1) (b) Let f: R → R be a non-linear function such that f(tx) = tf(x) for all t ≤ R, x ER". Show that f is not differentiable at 0.
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