EDB — 1FJ

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E39

[1FJ] Write the Taylor polynomial of \(f(x)\) around \(x_ 0=0\), using ”Landau’s calculus of \(o(x^ n)\)” seen above.

\(f(x)\)

=

\(p(x) + o(x^ 4)\)

\((\cos (x))^ 2\)

=

 

\(+o(x^ 4)\)

\((\cos (x))^ 3\)

=

 

\(+o(x^ 4)\)

\(\cos (x)e^ x\)

=

 

\(+o(x^ 4)\)

\(\cos (\sin (x))\)

=

 

\(+o(x^ 4)\)

\(\sin (\cos (x))\)

=

 

\(+o(x^ 4)\)

\(\log (\log (e+x))\)

=

 

\(+o(x^ 3)\)

\((1+x)^{1/x}\)

=

 

\(+o(x^ 3)\)

(A little imagination is required to address the last two. To reduce the computations, develop the last two only up to \(o(x^ 3)\)).

Solution 1

[1FK]

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Bibliography
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  • Taylor's theorem
  • Taylor's theorem
  • Landau symbols
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