Question 960754
<pre>
{{{cot(A)}}}{{{""=""}}}{{{sin(2A)/(1-cos(2A))}}}

Use these two identities on the right side: 

              {{{sin(2theta)=2sin(theta)cos(theta)}}} and {{{cos(2theta)=1-2sin^2(theta)}}}

     {{{""=""}}}{{{(2sin(A)cos(A))/(1-(1-2sin^2(A)))}}}

     {{{""=""}}}{{{(2sin(A)cos(A))/(1-1+2sin^2(A))}}}

     {{{""=""}}}{{{(2sin(A)cos(A))/(2sin^2(A))}}}

     {{{""=""}}}{{{(cross(2)cross(sin(A))cos(A))/(cross(2)sin^cross(2)(A))}}}


     {{{""=""}}}{{{cos(A)/sin(A)}}}

     {{{""=""}}}{{{cot(A)}}}
Edwin</pre>