Exercise 4.3.2. Let I CR be an open interval, let c E I, let n E N and let f1,..., fn : I¬R be functions. Suppose that fi is differentiable at c for all i e {1,...,n}. Prove that fif2 fn is differentiable at c, and find (and prove) a formula for (fi f2 -… fn)'(c) in terms of fi(c), ... fn(c) and f{(c),...f,(c). ...

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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4.3.2

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Exercise 4.3.2. Let I CR be an open interval, let c E I, let n E N and let fi,..., fn :
I–R be functions. Suppose that fi is differentiable at c for all i E {1,...,n}. Prove
that fi f2 -. fn is differentiable at c, and find (and prove) a formula for (fi f2·… fn)' (c)
in terms of fi (c), ..., fn(c) and f{(c),..., f„(c).
Transcribed Image Text:Exercise 4.3.2. Let I CR be an open interval, let c E I, let n E N and let fi,..., fn : I–R be functions. Suppose that fi is differentiable at c for all i E {1,...,n}. Prove that fi f2 -. fn is differentiable at c, and find (and prove) a formula for (fi f2·… fn)' (c) in terms of fi (c), ..., fn(c) and f{(c),..., f„(c).
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