Question 171819
<pre><font size = 4 clor = "indigo"><b>
{{{sqrt(2-4/z^2+2/z^4)}}}

Get LCD of {{{z^4}}}

{{{sqrt(2z^4/z^4-4z^2/z^4+2/z^4)}}}

{{{sqrt((2z^4-4z^2+2)/z^4)}}}

{{{sqrt(2(z^4-2z^2+1)/z^4)}}}

{{{sqrt(2(z^2-1)(z^2-2)/z^4)}}}

{{{sqrt(2(z^2-1)^2/z^4)}}}

{{{sqrt(2)sqrt((z^2-1)^2)/sqrt(z^4)}}}

{{{(sqrt(2)abs(z^2-1))/z^2)}}}

Edwin</pre>