We need to prove where t and and be V Dv (tg) = f Dv g + gDvf д I are continuously differentiable function a unit vector in R² c is constant

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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We need to prove: Dv (tg) = f Dvg+ gDvf
where I and I are continuously differentiable function
g
and
V
be
a unit vector in R² c is constant
Proof:
Dv (tg) = lim fg (((y) +hi) - fg(x, y)
nyo
h
lim tray) thì)
ที่
adding and substracting fex,y) g[(x,y) thú}, g(x,y)
=
+ [(y)+ hu], g(xi) fr1.y), weget
Now, after
this,
=
=
=
arrany
= lim t
40
ho h
li'm ± [f[wy) + hv].g[(x,y)thv] -f(x,y). gltiy) +
fexy). g [(y) thi] + g(x₁y); f [(x₁y) +hv] +
g(xy). feliy) - fravy) g [(x,y) thi]-gexy)
[fex,y) thr] - geziy) -fexix)]
_g[(x,y) th√ ] - fexias g11.2)]
the terms, we
[fexiy) [g(x,y)+hiv]_gex,y)] + gexry) [fellysthu)- texs)]/
+g [[xy) th√) [fxy) th√ - Jexy)) +
get
genvy) [f([^vy) thú) - Jers) ]
-
fexiy) Drgexy)+ делін) От texiy)
Dv (g) = fDvg+ govt
Transcribed Image Text:We need to prove: Dv (tg) = f Dvg+ gDvf where I and I are continuously differentiable function g and V be a unit vector in R² c is constant Proof: Dv (tg) = lim fg (((y) +hi) - fg(x, y) nyo h lim tray) thì) ที่ adding and substracting fex,y) g[(x,y) thú}, g(x,y) = + [(y)+ hu], g(xi) fr1.y), weget Now, after this, = = = arrany = lim t 40 ho h li'm ± [f[wy) + hv].g[(x,y)thv] -f(x,y). gltiy) + fexy). g [(y) thi] + g(x₁y); f [(x₁y) +hv] + g(xy). feliy) - fravy) g [(x,y) thi]-gexy) [fex,y) thr] - geziy) -fexix)] _g[(x,y) th√ ] - fexias g11.2)] the terms, we [fexiy) [g(x,y)+hiv]_gex,y)] + gexry) [fellysthu)- texs)]/ +g [[xy) th√) [fxy) th√ - Jexy)) + get genvy) [f([^vy) thú) - Jers) ] - fexiy) Drgexy)+ делін) От texiy) Dv (g) = fDvg+ govt
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