Question 1077472
<pre>
{{{sec^2(X)/(sec^2(X)-1)=2}}} 

{{{sec^2(X)=2(sec^2(X)^""-1)}}} 

{{{sec^2(X)=2sec^2(X)^""-2}}} 

{{{-sec^2(X)=-2}}}

{{{sec^2(X)=2}}}

{{{sec(X) = "" +- sqrt(2)}}}

{{{matrix(1,7,X=pi/4,",",X=3pi/4,",",X=5pi/4,",",X=7pi/4)}}} 

Edwin</pre>