Question 973867
<pre>
{{{cos(2x)+1}}}{{{""=""}}}{{{sin(2x)}}}
{{{2cos^2(x)-1+1}}}{{{""=""}}}{{{2sin(x)cos(x)}}}
{{{2cos^2(x)}}}{{{""=""}}}{{{2sin(x)cos(x)}}}
{{{cos^2(x)}}}{{{""=""}}}{{{sin(x)cos(x)}}}
{{{cos^2(x)-sin(x)cos(x)}}}{{{""=""}}}{{{"0"}}}
{{{cos(x)(cos(x)^""-sin(x))}}}{{{""=""}}}{{{"0"}}}
{{{cos(x)}}}{{{""=""}}}{{{"0;"}}}      {{{cos(x)^""-sin(x)}}}{{{""=""}}}{{{"0"}}}
{{{x}}}{{{""=""}}}{{{matrix(1,3,pi/2,and,3pi/2)}}}        {{{-sin(x)}}}{{{""=""}}}{{{-cos(x)}}}
                      {{{(-sin(x))/(-cos(x))}}}{{{""=""}}}{{{1}}}
                        {{{tan(x)}}}{{{""=""}}}{{{1}}}
                        {{{x}}}{{{""=""}}}{{{matrix(1,3,pi/4,and,5pi/4)}}}

Edwin</pre>