we define the simbol <tt>g</tt> in terms of <tt>f</tt> (previously
defined in <tt>%i1</tt>) and the hyperbolic sine function, and find its
Taylor series expansion (up to, say, order 3 terms) about the point
<tt>x = 0</tt>:

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<pre>
(%i6)&nbsp;g:&nbsp;f&nbsp;/&nbsp;sinh(k*x)^4;
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