Question 1061479
<pre>
                     {{{sec^2(theta)}}}{{{""=""}}}{{{(2tan(theta))/(sin(2theta))}}}

Work with the right side only:

Use an identity for the numerator and denominator

                            {{{(2*(sin(theta)/cos(theta)))/(2sin(theta)cos(theta))}}} 

                            {{{(2sin(theta)/cos(theta))*(1/(2sin(theta)cos(theta)))}}}

                            {{{(cross(2)cross(sin(theta))/cos(theta))*(1/(cross(2)cross(sin(theta)))cos(theta)))}}}

                            {{{1/(cos(theta)*cos(theta))}}}

                            {{{1/cos^2(theta)}}}

                            {{{sec^2(theta)}}}

Edwin</pre>